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Journal articles on the topic 'Asterion'

Author: Grafiati

Published: 4 June 2025

Last updated: 15 July 2025

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1

Sara, Fatima, Mariya, and Yahya Bin Mahfooz Sufiyan. "Unlocking the Mystries of Asterion Morphology in Skulls of South Indian Origin: Differences and Similarities Across Geographical Areas." International Journal of Toxicological and Pharmacological Research 13, no. 4 (2023): 331–36. https://doi.org/10.5281/zenodo.11222019.

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<strong>Background: </strong>Asterion is a craniometric point corresponding to the location of transverse sinus and closely related to transverse sigmoid junction. Asterion is classified as type I and type II based on the presence or absence of wormian bones respectively. Differences in the occurrence of sutural bones among populations could be attributed to racial, geographical, topographical variations, dietary patterns and genetic inheritance. <strong>Aim:</strong> To enhance the knowledge of prevelance of types of asterion in Telangana region. <strong>Material and Methods:</strong> 100 adult human dry skulls (200 asterions) from different medical colleges of Telangana state were studied and the type of asterion on each side was observed and compared with other geographical areas. <strong>Result : </strong>Study revealed a Prevalence of 21% of type I asterion on right side, 19% on left side and 79% of type II asterion on right side and 81% on left side.The total prevalence of type I was 20% and type II was 80%. Further, bilateral incidence of type I was 6% and type II was 69%. <strong>Conclusion:</strong> The prevalence of type I asterion ranged from 7.5% to 88.46% and type II asterion 11.56% to 92.5% in different populations, Type II being more common than Type I except for Nepalese and Mexicans. The presence of sutural bones at asterion may complicate the surgical orientation and may be misdiagnosed as fractures of skull bones in medicolegal cases, hence it has important implications in Neuro and Maxillofacial surgeries.

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Coşkun, Osman, Mehmet Yiğit, Beyza Çelikgün, Fatma Ok, Ahmet Ertaş, and Özcan Gayretli. "The Morphological and Morphometric Examination of the Asterion in Terms of Surgical Approaches to the Posterior Cranial Fossa." European Journal of Therapeutics 31, no. 2 (2025): 90–101. https://doi.org/10.58600/eurjther2621.

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Objective: The asterion is an important cranial anatomical landmark used in surgical approaches to the posterior cranial fossa, which is one of the most complex and surgically challenging regions of human anatomy due to the density of neurovascular structures. This study aims to examine the morphological and morphometric variations of the asterion to determine its preoperative localisation and help neurosurgeons reduce possible complications by providing an understanding of the detailed anatomy of the asterion in surgical approaches applied in posterior cranial fossa pathologies. Methods: In our study, adult human dry skull specimens (44 intact, 104 hemi skulls) with unknown demographic data were analysed. The asterions were first examined morphologically and categorised into two classifications. These classifications were based on the presence of wormian bone and the distance from the Frankfurt horizontal plane (FHP). Morphometric measurements were based on anatomical landmarks in the human skull. The landmarks used in the measurements were the lambda (L), FHP, the root of the zygomatic arch (RZA), the tip of the mastoid process (TMP), Henle’s spine (HS), external occipital protuberance (EOP), basion (B), opisthion (O) and porion (P). Results: The morphological classification of the asterions was examined. Type 1 and Type 2 were determined as 13.02% and 86.98%, respectively, according to the presence of the wormian bone. In the classification, according to the distance to the FHP, Type 1 was 9.90%, Type 2 was 58.85% and Type 3 was 31.25%. In morphometric measurements, the mean distance of the asterion to L was 85.16 ± 5.64 mm and 84.41 ± 5.43 mm on the right and left sides, respectively. The mean distance of the asterion to the FHP was 13.17 ± 6.81 mm and 14.01 ± 6.96 mm on the right and left sides, respectively. The mean distance of the asterion to the RZA was 56.18 ± 3.58 mm and 56.64 ± 3.69 mm on the right and left sides, respectively. The mean distance of the asterion to the TMP was 49.42 ± 4.16 mm and 48.91 ± 4.03 mm on the right and left sides, respectively. The mean distance of the asterion to HS was 46.15 ± 3.74 mm and 46.69 ± 3.79 mm on the right and left sides, respectively. The mean distance of the asterion to the EOP was 63.19 ± 4.13 mm and 62.71 ± 4.07 mm on the right and left sides, respectively. The mean distance of the asterion to B was 73.50 ± 3.73 mm and 72.96 ± 3.51 mm on the right and left sides, respectively. The mean distance of the asterion to O was 62.46 ± 2.88 mm and 62.23 ± 2.85 mm on the right and left sides, respectively. Finally, the mean distance of the asterion to P was 49.51 ± 3.87 mm and 50.32 ± 3.94 mm on the right and left sides, respectively. Conclusion: The results obtained in our study suggest that the accurate preoperative positioning of the asterion may contribute to reducing complications that may develop in neurosurgeons’ surgical approaches to the posterior cranial fossa.

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Usha Verma, Ritu Singroha, Amit Kumar Saxena, Prachi Saffar Aneja, and Suresh Kanta Rathee. "Sutural Morphology of Asterion in Dry Human Skulls." International Journal of Research in Pharmaceutical Sciences 11, SPL4 (2020): 1463–66. http://dx.doi.org/10.26452/ijrps.v11ispl4.4323.

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Sutural bones are usually small, irregularly shaped bones, often found in sutures of the cranium. It is important to know about them as they may complicate the surgical orientation if present in the asterion. The study aims to observe the incidence of the sutural morphology of asterion in dry human skulls. Total 120 human adult dry skulls consisting of 80 male and 40 female skulls were analyzed for Type-I and Type-II asterions. out of 120 skulls, (n=240) Type-I asterion was observed in 36 (15%) skulls, and Type-II was observed in 204 (85%) skulls. Type-I was 28 (17.5%) in males, 8 (10.0%) in females and 36 (15.0%) in total skulls. Type-II was 132 (82.5%) in males, 72 (90.00%) in females and 204 (85.0%) in total skulls. In the present study, the incidence of Type-I asterion was found more in males than females. The study can be useful to neurosurgeons, forensic experts, anthropologists and radiologists.

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Guarnera, Alessia, Guido Trasimeni, Andrea Romano, et al. "Dermoid Cysts of the Asterion: An Unusual Location for Unusual Dermoids, Radiological Findings and Neurosurgical Implications." Tomography 8, no. 2 (2022): 1141–47. http://dx.doi.org/10.3390/tomography8020093.

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Asterion is an uncommon site for lesions, especially dermoid cysts. We report a case series of three asterional intracranial dermoid cysts, which, to the best of our knowledge, have never been described before. Patients presented with non-specific symptoms and underwent surgical excision of the lesions. It is crucial to correctly diagnose intracranial masses and to identify their relationships with surrounding anatomical structures, especially if the location is unusual as the asterion, to plan surgery. The challenge of this tumor location is to preserve the venous drainage system during surgical procedures, because of the contiguity between the asterion and the transverse–sigmoid junction. Rupturing or damaging of the venous drainage system have been proven to be catastrophic because they lengthen surgical time and present dire consequences for patients. In conclusion, it is crucial to familiarize with atypical dermoid presentation to ensure proper diagnoses and to perform adequate imaging for optimal surgical planning.

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Khan, Gulam Anwer. "Morphometric Study on Types of Asterion in Dry Human Skull of Nepalese Origin." Med Phoenix 7, no. 1 (2022): 31–35. http://dx.doi.org/10.3126/medphoenix.v7i1.45877.

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Introduction: The asterion is important bony landmark of skull important for surgical approach to the posterior cranial fossa. The variation is type of asterion is due to presence or absence of lambdoidal suture, parietomastoid suture and occipitomastoid suture. Asterion is starry or triangular depression located 2.5cm behind the upper part of root of ear. Asterion is meeting point of lambdoidal suture, parietomastoid suture and occipitomastoid suture. Materials and Methods: Altogether 26 dry adult human skulls were collected from Department of Anatomy at School of Basic Sciences in Chitwan Medical College for research. Gender and ethnicity were undefined. All damaged skull and newborns are excluded. Both sides of skull were studied for location and type of asterion. The types of asterion were noted by observing the presence or absence of all three sutures. Photograph were taken and studied. Statistical analysis was done using SPSS 17. Results: Twenty-six human skulls of unknown gender were examined. Two types of asterion were observed. The type I asterion was 88.5 percent and type II asterion was 11.5 percent on both side of skull. Conclusion: we believe that there are different types of asterion present in human skull. Asterion is the important surgical landmark. Thereby, the finding may be helpful in surgical approach and intervention.

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Ribas, Guilherme C., Albert L. Rhoton, Oswaldo R. Cruz, and David Peace. "Suboccipital burr holes and craniectomies." Neurosurgical Focus 19, no. 2 (2005): 1–12. http://dx.doi.org/10.3171/foc.2005.19.2.2.

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Object The goal of this study was to delimit the external cranial projection of the transverse and sigmoid sinuses, and to establish initial strategic systematized burr hole sites for lateral infratentorial suboccipital approaches based on external cranial landmarks particularly related to the lambdoid, occipitomastoid, and parietomastoid sutures. Methods The external cranial projection of the transverse and sigmoid sinuses was studied through their external outlining obtained with the aid of multiple small perforations made from inside to outside along the inner margins of the sinuses of 50 paired temporoparietooccipital regions in 25 dried adult human skulls. The burr hole placement was studied by evaluating the supratentorial, over-the-sinuses, and infratentorial components of 1-cm-diameter openings made at strategic sites identified in the initial part of the study, which was performed in another 50 paired temporoparietooccipital regions. The asterion and the midpoint of the inion–asterion line were found to be particularly related to the inferior half of the transverse sinus; the transverse and sigmoid sinuses' transition occurs 1 cm anteriorly to the asterion across the parietomastoid suture, and the most superior part of the sigmoid sinus is located anteriorly to the occipitomastoid suture, with its posterior margin crossing this suture posteriorly to the most superior aspect of the mastoid process, which is located at the most superior level of the mastoid notch. Burr holes made at the midpoint of the inion–asterion line, at the asterion, 1 cm anterior to the asterion, just inferiorly to the parietomastoid suture, and over the occipitomastoid suture at the most superior level of the mastoid notch are appropriate to expose the inferior half of the transverse sinus at its midpoint, the inferior half of the transverse sinus at its most lateral aspect, the transverse and sigmoid sinuses' transition, and the posterior margin of the basal aspect of the sigmoid sinus, respectively. Conclusions These findings allow an estimation of the transverse and sigmoid sinuses' external cranial projection. The asterion and the most posterior part of the parietomastoid suture constitute a suitable initial burr hole site at which to perform an upper or asterional suboccipital craniectomy to expose the superior aspect of the cerebellopontine angle (CPA). The occipitomastoid suture at the most superior aspect of the mastoid notch constitutes an adequate initial burr hole site at which to perform a basal suboccipital craniectomy to expose the lower portion of the CPA. The sites can be used together as initial burr hole sites to perform wide suboccipital exposures, because they already constitute natural infratentorial lateral limits.

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Vrionis, Fotios D., Jon H. Robertson, Carl B. Heilman, and Edward Rustamzedah. "Asterion Meningiomas." Skull Base 8, no. 03 (1998): 153–61. http://dx.doi.org/10.1055/s-2008-1058575.

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Aydın Kabakçı, Anıl Didem, Duygu Akın Saygın, Mustafa Büyükmumcu, et al. "The relationship between the mastoid triangle and localization of the Asterion." Anatomy 15, no. 3 (2021): 189–97. http://dx.doi.org/10.2399/ana.21.1053714.

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Objectives: The relationship between the mastoid triangle and the localization of the Asterion can be used in craniotomy and posterolateral surgical approaches. Therefore, we aimed to identify the relationship between the localization of the Asterion and mastoid triangle in dry skulls and its effect on surgery. Methods: Our study was performed on 93 adult skulls obtained from bone collections of the Anatomy Departments of Necmettin Erbakan University and Akdeniz University. The mastoid triangle, Asterion and linear distances between them were measured for to determine the localization of the Asterion. Results: The Asterion was located just above the Frankfurt horizontal plane on the left sides of the skulls in 54 (58.1%) specimens and on the right sides of the skulls in 71 (76.3%). It was located below the Frankfurt horizontal plane on the left sides of the skulls in 39 (41.9%) specimens; and on the right sides of the skulls in 19 (20.4%). There was a positive correlation between the distance of Asterion to apex of the mastoid process (r=0.832). Conclusion: The relationship between the mastoid process and the Asterion can be used for determination of the dural venous sinuses and neighboring neurovascular structures, in retrosigmoid posterolateral surgical approaches.

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T., Ramesh Rao, and R. Rao Suresh. "Anatomical Variation of Asterion in Human Dry Skull – A Case Report." International Journal of Case Studies 5, no. 5 (2016): 41–44. https://doi.org/10.5281/zenodo.3530978.

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Sutural bones are usually small, irregularly shaped ossicles, often found in the sutures of the cranium, especially those in relation with the parietal bones. Their size, shape and number vary from skull to skull. The asterion corresponds to the site of the posterolateral (mastoid) fontanelle of the neonatal skull which closes at the end of the first year. The asterion is the junction of the parietal, temporal and occipital bones. During the routine osteology demonstration class for undergraduate students, five Wormian bones were noted at the asterion in an adult skull. The asterion is a surgical landmark to the transverse sinus location which is of great importance in the surgical approaches to the posterior cranial fossa. The study of asterion may be helpful to ENT and Neurosurgeons

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Saravana, Kumar S. "STUDY OF ANATOMICAL VARIATION OF ASTERION IN HUMAN DRY SKULLS AND ITS SURGICAL IMPORTANCE." Journal of Medical pharmaceutical and allied sciences 10, no. 6 (2021): 4041–44. http://dx.doi.org/10.22270/jmpas.v10i6.1847.

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Asterion is the meeting point of temporal, occipital, and parietal bones on the posterolateral surface of the skull. This point is surgically important in various posterior cranial fossa surgeries since it is a smaller delicate area where many vital structures are present. The Neurosurgeons have been doubtful about its accuracy due to population-based differences in its morphology and its location with relationship to sigmoid and transverse sinuses. In this study 100 (54 male & 46 female) adult skulls were measured to accurately the type of asterion, its distance from important bony landmarks, and also the nearby venous sinuses were measured. Our study revealed that type II (absence of sutural bones) is the commonest type when compared to type I (presence of sutural bones) asterion. The asterion was 4.82 ± 0.58 cm from the apex of the mastoid process on the right side and 4.70 ± 0.70 cm on the left. It was higher in males than in females, p-value being statistically significant (P = 0.00 & P = 0.02 for right & left sides respectively). The distance of asterion from supramastoid crest is 4.22 ± 0.73 cm on the right and 4.23+/-0.58 cm on the left. The distance in males is higher than in females. The position of the asterion in relation to transverse sinus was at the level of the transverse sinus in 74.67% of cases, and inferior to the asterion in 22.41%, and superior to the asterion in 2.92%. The measure taken reveals that the asterion is located either at the level or below the level of the transverse sinus in the majority of the cases. This information is useful to neurosurgeons to minimize the risk during posterior cranial fossa surgeries. This study is useful for anthropologists, forensic science experts for the determination of the sex of the skull along with other parameters.

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Havaldar, Pavan P., Shruthi B.N, Shaik Hussain Saheb, and Henjarappa K S. "Morphological Study on Types of Asterion." International Journal of Integrative Medical Sciences 2, no. 10 (2015): 167–69. http://dx.doi.org/10.16965/ijims.2015.127.

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Jimenez, David F., Constance M. Barone, Ravelo V. Argamaso, James T. Goodrich, and Robert J. Shprintzen. "Asterion Region Synostosis." Cleft Palate-Craniofacial Journal 31, no. 2 (1994): 136–41. http://dx.doi.org/10.1597/1545-1569(1994)031<0136:ars>2.3.co;2.

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Jimenez, David F., Constance M. Barone, Ravelo V. Argamaso, James T. Goodrich, and Robert J. Shprintzen. "Asterion Region Synostosis." Cleft Palate-Craniofacial Journal 31, no. 2 (1994): 136–41. http://dx.doi.org/10.1597/1545-1569_1994_031_0136_ars_2.3.co_2.

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Posterior plagiocephaly historically has been associated with synostosis of the lambdoid suture. The incidence, diagnosis, and modes of treatment for stenosis of the lambdoid suture remain controversial. Commonly, the lambdoid suture is found to be open both on radiographic examination and at the time of surgery. The study reports on nine patients who presented with unilateral posterior plagiocephaly and who were found to have open lambdoid sutures, but a stenosed region of the asterion. The area of Involvement included the distal-most lambdoid suture, the parietomastoid, occipitomastoid, and proximal squamosal sutures. Positional molding or torticollis was ruled out in all patients. All the patients showed progressive involvement of the skull base, including anterior shifts of the ipsilateral ear, compensatory Ipsilateral frontal bossing and malar protrusion. Stenosis of the asterion was diagnosed with three-dimensional computed tomography scans, corroborated at the time of surgery and confirmed histologically. Surgical correction Involved resection of the affected asterion and reconstruction using a bandeau-technique, barrel staves of the occipital bone and bone graft transposition. This approach provided excellent esthetic results in all patients.

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Hernández Henríquez, María Mercedes. "The Minotaur: a look borgiana." Revista de Investigaciones de UNIAGRARIA 2, no. 1 (2014): 65–71. http://dx.doi.org/10.33133/riu-2-2014-74.

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This article is seeking to point how, starting with a Jorge Luis Borges’ fantastic story “La Casa de Asterion” (1949), the concept of the image of the Greek mythic character Minotaur changed for the subsequent generations, acquiring a new connotation. To be able to comprehend in its entirely the redimensioning that the Bonaire born provided to this fantastic being, half man, half bull, it is necessary to read “La Casa de Asterión” in the light of the Greek tradition, for which we will recur to utilize the ancient story and the classical sources.

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Gharabaghi, Alireza, Steffen K. Rosahl, Günther C. Feigl, et al. "Image-Guided Lateral Suboccipital Approach: Part 1—Individualized Landmarks for Surgical Planning." Operative Neurosurgery 62, suppl_1 (2008): ONS18—ONS23. http://dx.doi.org/10.1227/01.neu.0000317369.07641.9c.

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Abstract Objective: Being situated close to the transverse and sigmoid sinus, the asterion has traditionally been viewed as a landmark for surgical approaches to the posterior fossa. Cadaveric studies, however, have shown its variability in relation to underlying anatomic structures. We have used an image-guidance technology to determine the precise anatomic relationship between the asterion and the underlying transverse-sigmoid sinus transition (TST) complex in patients scheduled for posterior fossa surgery. The applicability of three-dimensional (3-D) volumetric image-rendering for presurgical anatomic identification and individualization of a surgical landmark was evaluated. Methods: One-millimeter computed tomographic slices were combined with venous computed tomographic angiography in 100 patients, allowing for 3-D volumetric image-rendering of the cranial bone and the dural vasculature at the same time. The spatial relationship between the asterion and the TST was recorded bilaterally by using opacity modulation of the bony surface. The location of both the asterion and the TST could be confirmed during surgery in all of these patients. Results: It was possible to accurately visualize the asterion and the sinuses in a single volumetrically rendered 3-D image in more than 90% of the patients. The variability in the anatomic position of the asterion as shown in cadaveric studies was confirmed, providing an individualized landmark for the patients. In this series, the asterion was located from 2 mm medial to 7 mm lateral and from 10 mm inferior to 17 mm superior to the TST, respectively. Conclusion: Volumetric image-rendering allows for precise in vivo measurements of anatomic distances in 3-D space. It is also a valuable tool for assessing the validity of traditional surgical landmarks and individualizing them for surgical planning.

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Yadav, Sudeep Kumar, Anusuya Shrestha, Niraj Pandey, et al. "Study of the Variations of Asterion, Pterion & Inion in Human Dry Skulls & its Anthropological importance." Janaki Medical College Journal of Medical Science 10, no. 2 (2022): 23–27. http://dx.doi.org/10.3126/jmcjms.v10i2.47854.

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Background and objectives: Asterion is the meeting point of three bones namely parietal, temporal and occipital bones in the norma lateralis of all human skulls the variations showed a pattern of formations. Pterion is the point of convergence of the sutures between the frontal, sphenoid, parietal and squamous temporal bones. Asterion have profound surgical importance.  Materials and methods: Good intact skulls from different medical college of Nepal were used for the present study. Each skull was studied in detail regarding the formation of Asterion, Pterion on both sides and associated findings were observed. Sixty eight dry unknown human skulls constituted the materials for the present study. The observation was made on Asterion, Pterion & Inion. This study was done in the departments of Anatomy in different medical colleges of Nepal between the years 2019-2021. Results: Incidence of asterion with wormian bones on the right side was 4.41% that of the left side 5.88%. More number of H shaped pterion on the right side [80.82%} than on left side [70.94%). Presence of Wormian bones more on the right side [7.69%] than on the left side [2.94%) were observed. Conclusion: The knowledge of the formation of asterion and the presence of wormian bones in the sutures at the site and its effect should be known not only to the Anatomists but also to the Radiologist and the Neurosurgeons because it has profound neurosurgical importance. Hence this study has been done and reported.

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Natekar, PrashantE, SuhitE Natekar, and FatimaM De Souza. "Inca bones at asterion." Indian Journal of Otology 20, no. 4 (2014): 189. http://dx.doi.org/10.4103/0971-7749.146936.

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Martínez, F., A. Laxague, L. Vida, et al. "Anatomía topográfica del asterion." Neurocirugía 16, no. 5 (2005): 441–46. http://dx.doi.org/10.1016/s1130-1473(05)70392-4.

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Sharma, Saksham, Harsimar Kaur, Kiranmai Venkatagiri, Pari Desai, and Deepthi Chintala. "Enhancing mental health care with AI: a review discussing biases, methodologies, and clinician preferences." International Journal of Research in Medical Sciences 12, no. 11 (2024): 4371–77. http://dx.doi.org/10.18203/2320-6012.ijrms20243407.

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Integrating artificial intelligence (AI) into mental health care offers promising avenues for improving diagnostic accuracy, personalised treatment, and healthcare delivery. However, potential biases, methodological considerations, and the impact on clinical decision-making warrant critical examination of the implementation of AI in mental health practices. In this study 50 (27 male and 23 female) adult skulls were investigated to determine the type of asterion, its distance from important bony landmarks and also the nearby venous sinuses were measured. This study revealed that type II (absence of sutural bones) was commoner than type I (presence of type I) asterion. Regarding the position of the asterion in relation to transverse sinus, it was on the transverse sinus in 62% cases, below it in 32% and above in 6%. The data obtained shows that the asterion is located either at the level or above the level of the transverse sinus in majority of the cases. This information is useful to neurosurgeons to reduce the risk during posterior cranial fossa surgeries. This work will also be useful to anthropologists, forensic science experts for determination of sex of the skull along with other parameters.

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Morales Ávalos, Rodolfo, Mario v. Aguilar Alvarado, Rodrigo E. Elizondo Omaña, and Santos Guzmán López. "ESTUDIO MORFOLÓGICO DEL PTERION Y ASTERION EN CRÁNEOS ADULTOS MEXICANOS. Estudio morfológico del pterion y asterion en cráneos adultos mexicanos." Revista Argentina de Anatomía Clínica 3, no. 2 (2016): 77–83. http://dx.doi.org/10.31051/1852.8023.v3.n2.13923.

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Introducción. El pterion y asterion son puntos craneométricos de confluencia sutural observables en una vista lateral del cráneo, ambos representan puntos de referencia y/o acceso dentro del campo de la neurocirugía así como puntos de importancia dentro de la antropología física y medicina legal por sus diferencias morfológicas entre las diferentes poblaciones. Materiales y Métodos. Se examinaron ochenta y cinco cráneos secos de adultos mexicanos bilateralmente, se obtuvieron las distancias promedio entre el centro del pterion y el borde posterior de la sutura frontocigomática, borde superior del arco cigomático, base de la fosa mandibular, vértice de la apófisis mastoides y el centro del asterion. Resultados. Se identificaron cuatro tipos de pterion: esfenoparietal (90%), estellar (4.12%), epiptérico (3.53%) y frontotemporal (2.35%). Se identificaron dos tipos de asterion: tipo 1 (7.06%) y tipo 2 (92.94%). Conclu-siones. Los resultados obtenidos en la morfología sutural de ambos puntos y los resultados de las mediciones son de importancia para el abordaje neuroquirúrgico del cráneo, patólogos forenses y antropólogos. Introduction. Pterion and asterion are craniometrical landmarks of sutural confluence observable in a lateral view of the skull. Both represent points of reference and/or access in the field of neurosurgery, and are aspects of importance in disciplines such as physical anthropology and legal medicine for the morphological differences between the different populations. Materials and Methods. Examinations were conducted bilaterally in 85 (eighty five) dry skulls from Mexican adults. The average distances were obtained from the center of the pterion to the following landmarks: posterior edge of the frontozygomatic suture, superior edge of the zygomatic arch, base of the mandibular fossa, vertex of the mastoid process and the center of the asterion. Results. Four types of pterion were identified: sphenoparietal (90%), stellar (4.12%), epipteric (3.53%) and frontotemporal (2.35%). Two types of asterion were identified: type 1 (7.06%) and type 2 (92.94%). Conclusions. The results obtained in the analysis of the sutural morphology of both landmarks and the results of the measurements are of importance for the neurosurgical access of the skull, and are as well relevant to forensic pathologists and anthropologists.

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Day, J. Diaz, and Manfred Tschabitscher. "Anatomic Position of the Asterion." Neurosurgery 42, no. 1 (1998): 198–99. http://dx.doi.org/10.1097/00006123-199801000-00045.

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Bennett, Maurice J. "Borges's the House of Asterion." Explicator 50, no. 3 (1992): 166–70. http://dx.doi.org/10.1080/00144940.1992.9937945.

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Sayers, Jon. "Asterion: The Sheffield spinoff experience." Biochemist 30, no. 2 (2008): 8–12. http://dx.doi.org/10.1042/bio03002008.

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Early in the Spring of 2000, I attended a series of increasingly animated and exciting meetings with Richard Ross, a clinician with a passion for research specializing in endocrinology, and Pete Artymiuk, an equally enthusiastic structural biologist working in Sheffield University's Krebs Institute.

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Stewart, Jesse. "Creating the Asterion harmonograph mandala." Scene 3, no. 1 (2015): 95–98. http://dx.doi.org/10.1386/scene.3.1-2.95_7.

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Rodríguez Basili, Florencia, Matías Dorman, Axel Angerami, and Lucas Toibaro. "Localización preoperatoria de la trepanación inicial en el abordaje retrosigmoideo. Revisión de literatura y aplicación quirúrgica." Revista Argentina de Neurocirugía 34, no. 01 (2020): 55–61. http://dx.doi.org/10.59156/revista.v34i01.24.

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Objetivo: Evaluar una técnica eficaz y reproducible que permita determinar el sitio de la trepanación inicial en el abordaje retrosigmoideo.Materiales y métodos: Se empleó una muestra de 22 pacientes a fin de analizar la relación de la transición transverso – sigmoidea (TTS) con el asterion y la ranura digástrica. Todos los casos contaban con TC de cortes finos (1 mm de espesor). Se subdividieron los pacientes en dos grupos. Grupo 1: pacientes con patologías variables, sin alteraciones estructurales en la fosa posterior. Grupo 2: pacientes en los que se realizó un abordaje retrosigmoideo con planificación prequirúrgica del sitio de trepanación inicial.Discusión: Las referencias óseas (asterion y punto digástrico) pudieron identificarse en la totalidad de las TC 3D analizadas. Se analizaron las distancias empleando un sistema de coordenadas. La TTS se registró en el 78% de los casos anterior e inferior al asterion. En ningún caso se encontró la TTS superior al asterion, la ubicación en sentido inferior varió entre 0 mm y 25,5 mm (media 12,5 mm). En el plano anteroposterior, se registró una distancia entre -6,41 mm y 14,5 mm (media 4,09 mm), demostrando una gran variabilidad individual, comparable con lo descripto en la literatura. En el grupo 2, pudo predecirse de manera precisa la localización de la TTS, exponiendo la misma con la trepanación inicial.Conclusión: Se describe un método sencillo, eficaz, de libre acceso, que permite la ubicación del keyhole en el abordaje retrosigmoideo.

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Rewa, Natalie. "The Patria Cycle: Asterion, a labyrinth." Scene 3, no. 1 (2015): 59–63. http://dx.doi.org/10.1386/scene.3.1-2.59_7.

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Smith, Jerrard. "Asterion: A journey through the labyrinth." Scene 3, no. 1 (2015): 65–93. http://dx.doi.org/10.1386/scene.3.1-2.65_7.

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Orish, C. N., B. C. Didia, and H. B. Fawehinmi. "Sex Determination Using Inion-Opistocranium-Asterion (IOA) Triangle in Nigerians’ Skulls." Anatomy Research International 2014 (May 18, 2014): 1–5. http://dx.doi.org/10.1155/2014/747239.

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Background. Determination of sex is an important concern to the forensic anthropologists as it is critical for individual identification. This study has investigated the existence of sexual dimorphism in the dimensions and the area of the IOA triangle. Methods. A total of 100 adult dry skulls, (78 males; 22 females) from departments of anatomy in Nigerian universities were used for this study. Automatic digital calliper was used for the measurement. Coefficient of variation, correlation, linear regression, percentiles, and sexual dimorphism ratio were computed from the IOA triangle measurements. The IOA triangle area was compared between sexes. Results. The male parameters were significantly (P<0.05) higher than female parameters. The left opistocranium-asterion length was 71.09±0.56 and 61.68±3.35 mm and the right opistocranium-asterion length was 69.73±0.49 and 60.92±2.10 mm for male and female, respectively. A total area of IOA triangle of 1938.88 mm2 and 1305.68 mm2 for male and female, respectively, was calculated. The left IOA indices were 46.42% and 37.40% in males and females, respectively, while the right IOA indices for males and females were 47.19% and 38.87%, respectively. Conclusion. The anthropometry of inion-opistocranium-asterion IOA triangle can be a guide in gender determination of unknown individuals.

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Devi, Dr Laishram Nungshitombi, Dr Rajkumari Ajita, Dr G. Tempy N. Sangma, Dr Thounaojam Oken Singh, and Dr Khwairakpam Romi Devi. "Incidence Of Wormian Bones In Dried Human Skull Bones At Rims, Manipur." IOSR Journal of Dental and Medical Sciences 24, no. 6 (2025): 24–27. https://doi.org/10.9790/0853-2406042427.

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Background: Wormian bones also known as sutural bones, supernumerary bones, intersutural bones or intercalated bones are small, irregular ossicles occasionally found within the sutures of the cranial vault. These bones as a detached fragments originating from the primary ossification centers of adjacent membranous bones. They are most commonly found along the lambdoid suture, which is characteristically more complex and tortuous compared to other cranial sutures. Less commonly, they may also be present in the sagittal and coronal sutures, as well as in the regions of the pterion and asterion. Materials and Methods: 50 dried human adult skulls were used for this study. These were collected from the Department of Anatomy, RIMS, Imphal. Various sutures were examined carefully for the presence or absence of Wormian bones. The number and location of Wormian bone along the coronal, sagittal, lambdoid, occipitomastoid, parieto-temporal suture, bregma, lambda, pterion, asterion were noted. These findings were documented and relevant photographs of the Wormian bones were taken by using a digital camera. Results: We found wormian bones in total of 11 wormian bones out of 50 dried skull.Maximum wormian bones were observed at lambdoid suture 7 with incidence of 14%,lambda 1(2%),coronal suture 1 (2%),asterion 0 (0%) and inca bone 2(4%).

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Singh, Pankaj Kumar, Raj Kumar Karki, Abdul Sami Khan, Dhiraj Kumar Shah, and Sushant Bhardwaj. "Assessment of Sexual Dimorphism from the Mastoid Triangle Using 3d CT scan in Nepalese Population." Birat Journal of Health Sciences 6, no. 2 (2021): 1486–91. http://dx.doi.org/10.3126/bjhs.v6i2.40330.

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Introduction: Skull plays an important role, second only next to pelvis for sex determination. In skull, mastoid and occipital region due to its anatomical location is the most protected region, offering high resistance to decomposition and any form of tempering. With the intension of studying sexual dimorphism in the mastoid region involving mastoid process, we initiated this study. The technique we adopted was first introduced by Paiva and Segre, i.e. measuring the distance between three cranio-metric land mark (Porion, Mastoidale, and Asterion) and calculating the area of the triangle to study sexual dimorphism. Objective: The objective of this study is to determine sex based on mastoid triangle dimensions measured in 3D reconstructed computed tomography of the skull. Methodology: The study included 196, 3D reconstructed CT scan images of skull, 98 of which were males and 98 of which were females. The three craniometric points were marked to demarcate the mastoid triangle on both side (mention the software used).Heron’s formula was used for measurement of mastoid triangle areas. Result: Descriptive statistics and the student t-test revealed that males have larger mastoid triangle dimensions in all measurements than females, with a significant difference (p<0.000) between them. The paired t-test revealed no statistically significant difference (p<0.05) between the right and left sides. Apart from angle asterion (p<0.05) on the right side, no other mastoid triangle angles on either side showed a significant difference. The predictability of mastoid triangle measurements and areas was determined using a discriminant function and ROC curve analysis. The calculated mastoid triangle measurements and areas were 72.5 % of Asterion to Porion, 74.5 % of Asterion to Mastoidale, 86.3 % of Mastoidale to Porion, and 88.2 % of areas, respectively. Conclusion: The study findings suggest that mastoid triangle could be used to determine gender in the case of fragmentary skull remains by the forensic experts in the course of investigation. In order to generalize the data nationally, an autopsy-based, large sample size study on different age groups should be conducted.

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Kumari, Pinki, Aman Kumar, and Sanjeev Kumar. "Mastoidale, Asterion and Porion (MAP) Triangle – The Determinant of Sexual Dimorphism." Asian Journal of Medical Research 8, no. 3 (2019): FM07—FM09. http://dx.doi.org/10.21276/ajmr.2019.8.3.fm3.

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Tomaszewska, Agnieszka, Agata Bisiecka, and Ł. Pawelec. "Asterion localization – variability of the location for surgical and anthropological relevance." HOMO 70, no. 4 (2019): 325–33. http://dx.doi.org/10.1127/homo/2019/1124.

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Babacan, Serdar, Meriç Yildiz-Yilmaz, Ilker Mustafa Kafa, and Ihsaniye Coşkun. "The Surface and Intracranial Location of Asterion." Journal of Craniofacial Surgery 30, no. 8 (2019): e753-e755. http://dx.doi.org/10.1097/scs.0000000000005757.

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Hamasaki, Tadashi, Motohiro Morioka, Hideo Nakamura, Shigetoshi Yano, Toshinori Hirai, and Jun-ichi Kuratsu. "A 3‐DIMENSIONAL COMPUTED TOMOGRAPHIC PROCEDURE FOR PLANNING RETROSIGMOID CRANIOTOMY." Operative Neurosurgery 64, suppl_5 (2009): ons241—ons246. http://dx.doi.org/10.1227/01.neu.0000336763.90656.2b.

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Abstract OBJECTIVE The planning of retrosigmoid craniotomies often relies on anatomic landmarks on the posterolateral surface of the cranium, such as the asterion. However, the location of the asterion is not fixed with respect to the underlying transverse-sigmoid sinus complex. We introduce a simple procedure that uses 3-dimensional (3D) computed tomographic imaging to project the transverse-sigmoid sinus complex onto the external surface of the cranium. METHODS We enrolled 8 patients scheduled for retrosigmoid craniotomy (Group 1) and 30 patients without posterior fossa lesions (Group 2). The procedure consists of 3 steps: 1) marking the sinus on the internal surface on 3D images of the cranium, 2) transferring the marks to the external surface on axial images, and 3) checking the transferred marks on the external surface of the cranium on 3D images. RESULTS In Group 1, the craniotomies planned with the aid of our procedure coincided with findings made at surgery, indicating the accuracy of our procedure. When we applied it in morphometric studies in Group 2, we found that the relative location of the transverse-sigmoid sinus junction to the asterion, the superior nuchal line, and the posterior edge of the mastoid process exhibited a high degree of individual variation. CONCLUSION Retrosigmoid craniotomy standardized according to anatomic landmarks raises the risk for sinus injury because of variations in their location. We offer our 3D computed tomographic imaging-based procedure as a useful device for the planning of safer retrosigmoid craniotomies.

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Leão, Felipe. "Pro-Asterion." Das Questões 16, no. 1 (2023). http://dx.doi.org/10.26512/dasquestoes.v16i1.51476.

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O presente ensaio busca analisar o sinofuturismo a partir da tentativa de responder à pergunta de Galliano (2021): “qual é a cosmotécnica latino-americana?”. Para tanto, foi necessário traçar uma mitologia respectiva, que gerou uma cosmologia e, por fim, uma cosmotécnica. Possuindo uma origem ambígua e complexa, as sociedades latino-americanas buscaram “criar” sua mitologia na ficção. Por isso, foram utilizados autores que dialogam com as vanguardas futuristas de alguma maneira, quiçá sendo seus representantes à maneira latina: Mário de Andrade e Jorge Luis Borges. Em seus respectivos personagens Macunaíma e Asterion, os autores colateralmente provocaram uma identidade mitológica positiva. Utilizando a mitologia “dualista” dos latino-americanos e artigos recentes que analisam o sinofuturismo como fruto de um movimento diaspórico mais do que interno à China, propõe-se um Haiguifuturismo em seu lugar.

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Martínez, F., A. Laxague, L. Vida, et al. "Anatomía topográfica del asterion." Neurocirugía 16, no. 5 (2005). http://dx.doi.org/10.4321/s1130-14732005000500005.

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BAĞCI UZUN, Gökçe, and Mehtap NİSARİ. "CRANIUMDA BULUNAN SUTURLARIN MORFOMETRİK OLARAK DEĞERLENDİRİLMESİ." Sağlık Bilimleri Dergisi, September 13, 2022. http://dx.doi.org/10.34108/eujhs.1026239.

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Suturaların erken kaynaşması kraniyosinostoz olarak adlandırılır. Çalışmamızda kafatasında ölçümler yapılarak, cerrahi operasyonlarda ameliyat yerinin tespit edilmesine yardımcı olmak ve literatüre katkı sağlanmak amaçlandı. Erciyes Üniversitesi Tıp Fakültesi Anatomi Anabilim dalında yer alan 22 adet kafatası dijital kumpas ve mezura kullanılarak ölçümler yapıldı. Ölçülen parametereler sırasıyla: Sutura coronalis uzunluğu (SCU),Sutura sagittalis uzunluğu (SSU), Sutura lamboidea uzunluğu (SLU),Sağ-sol asterion arası mesafe (AAM), Sutura coronalis orta noktası (Bregma) – Sutura nasalis (Nasion) arası mesafe (BN), Nasion-Lambda arası mesafe (NLM), Nasion- İniondan geçen baş çevresi (NİBC), Lambda- İnion arası uzunluk (LİU), Pterion-Asterion arası Uzunluk (PAU), Asterion-İnion arası Uzunluk (AİU), Asterion- Prosesssus mastoideus arası mesafe (APM), Pterion- Prosesssus mastoideus arası mesafe (PMU), Pterion- İnion arası mesafe (PİM)’dir. Bu veriler IBM SPSS istatistik yazılımı (versiyon 15.0) kullanılarak hesaplama yapılmıştır. Yapılan ölçümlerimiz; PAU: 94.23±8.0-95.59±8.94 mm, AİU 71.97±9.85-67.55±8.42 mm, APM: 52.96±8.58-52.99± 9.19 mm, PMU: 86.68±11.37- 87.18±12.40 mm, PİM: 130.04±10.63-128.93±15.60 mm, SCU: 120.22±5.29 mm, SSU: 112.67± 8.71 mm, SLU: 153.95±26.18 mm, AAM: 106.91±14.19 mm, BN: 118.71± 19.44 mm, NLM: 162.16±15.12 mm, LİU:65.63±19.00, NİBC: 49.09± 1.37 cm olarak hesaplanmıştır. Sonuç olarak, elde ettiğimiz cranium’a ait bu indeks değerlerinin beyin cerrahisinde klinisyenlere ve literatüre katkı sağlayacağını düşünmekteyiz.

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Karunakaran, Sadhana, and Karthik Ganesh Mohanraj. "Morphometric Analysis and Variation of Pterion, Asterion and Lambda in Dry Human Skulls and Its Sexual Dimorphism." Journal of Pharmaceutical Research International, December 23, 2021, 1218–26. http://dx.doi.org/10.9734/jpri/2021/v33i60b34735.

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Introduction: Pterion is a H- shaped sutural junction of the frontal, parietal, squamous part of the temporal and greater wing of sphenoid bone. Asterion is a sutural junction of lambdoid, parietomastoid and occipitomastoid sutures. Lambda is the junction where lambdoid sutures and sagittal sutures meet. These sutures play an important role in infants' brain development. Flexibility of these allows the bones to overlap and hence it can pass through the brain canal easily without any damage to the brain. Aim: To analyse pterion asterion and lambda of dry human skulls morphologically and morphometrically and determine its sexual dimorphism. Materials and Methods: 40 dry human skulls were collected from the department of Anatomy of Saveetha dental college and hospitals. By excluding abnormal and damaged skulls, 20 skulls were studied. Out of 20 skulls, 11 were male skulls and 9 were female skulls. On investigation, Pterion was classified into four types: Sphenoparietal, stellate, Epipteric and Frontotemporal. Asterion was classified into types: Type-1 and Type-2 based on the presence and absence of wormian bones respectively. Lamda was classified into two types: Normal and Abnormal. Statistical analysis was done by SPSS software. Paired Sample T test was used to analyse the data. Results: Percentage of occurrence of different types of pterion in males and females: Sphenoparietal (59.09 % of males and 59.09 % of females), Stellate (27.7% of males and 22.2% of females), Epipteric (99% of males and 16.6% of females) and Frontotemporal (45.5% of males and 5.5% of females). Different types of Asterion: Type-1 (13.63% of males and 16.66 % of females and Type -2 (86.63% of males and 83.33% of females). Different types of Lambda: Normal (90.9% of males and 94.4% of females), Abnormal (9% of males and 5.55% of females). Conclusion: In the present study, there was no correlation between the male and female skulls in the presence of Pterion, Asterion and Lambda. Therefore these cannot be used as reliable parameters for determining sexual dimorphism.

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Ndoba, Alain Gervais. "Spinoza et le Dieu qui peut tout." Astérion, no. 23 (December 31, 2020). http://dx.doi.org/10.4000/asterion.5297.

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Moreau, Pierre-François. "Introduction." Astérion, no. 23 (December 31, 2020). http://dx.doi.org/10.4000/asterion.5217.

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Libertà De Bastiani, Marta. "Hobbes et Spinoza lecteurs de Tacite : histoire et politique." Astérion, no. 23 (December 31, 2020). http://dx.doi.org/10.4000/asterion.5267.

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Beddeleem, Martin, and Nathanaël Colin-Jaeger. "L’héritage conservateur du néolibéralisme." Astérion, no. 23 (December 31, 2020). http://dx.doi.org/10.4000/asterion.5452.

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Leblanc, Jean-Ganesh. "Historicisme et lutte de classes chez José Carlos Mariátegui." Astérion, no. 23 (December 31, 2020). http://dx.doi.org/10.4000/asterion.5382.

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Renz, Ursula. "Le bien de l’homme chez Spinoza : vers un existentialisme positif." Astérion, no. 23 (December 31, 2020). http://dx.doi.org/10.4000/asterion.5322.

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Kim, Eunju. "Suicide, conatus et conflictualité chez Spinoza." Astérion, no. 23 (December 31, 2020). http://dx.doi.org/10.4000/asterion.5222.

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Grangé, Ninon. "Bruno Godefroy, La fin du sens de l’histoire. Eric Voegelin, Karl Löwith et la temporalité du politique." Astérion, June 29, 2022. http://dx.doi.org/10.4000/asterion.7819.

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Molino-Machetto, Cédric. "Gouverner les hommes : généalogie de la violence chez Ibn Khaldûn." Astérion, no. 26 (August 18, 2022). http://dx.doi.org/10.4000/asterion.8297.

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Burns, Raphaëlle. "Foucault et la phronesis : les cas à l’épreuve de la singularité." Astérion, no. 26 (August 18, 2022). http://dx.doi.org/10.4000/asterion.8182.

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Moreau, Pierre-François. "Publier Spinoza dans la France du XIXe siècle." Astérion, no. 26 (August 18, 2022). http://dx.doi.org/10.4000/asterion.8037.

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Rouquayrol, Louis. "Un livre « utile en ce moment » : l’édition de Buffier comme pratique idéologique au XIXe siècle." Astérion, no. 26 (August 18, 2022). http://dx.doi.org/10.4000/asterion.7982.

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