Biomedical subjects

A Sevim

Publications and source records attributed to A Sevim.

6 recordsLinked to original sources

PubMed2004

Fossa navicularis: anatomic variation at the skull base.

The fossa navicularis is a relatively rare anatomic variation of the skull base. Awareness of its existence will avoid misinterpretations of radiological images and unnecessary investigations. This study describes the appearance of the fossa navicularis, and investigates its incidence and whether it is related to pathology at the basiocciput. We studied 492 dry human skulls and 525 computer tomography (CT) images of patients. Dry skulls showing a fossa navicularis were investigated by CT scan, whereas patients identified as having a fossa navicularis were further examined with magnetic resonance imaging (MRI). To document the position of the fossa more precisely, measurements were made between the fossa navicularis and certain anatomic landmarks such as the foramen ovale, the pharyngeal tubercle, the posterior border of the vomer, the foramen lacerum, the carotid canal, and the occipital condyle. Upon examination, 26 of 492 skulls (5.3%) were found to have a fossa navicularis. Twelve were <2 mm in depth and the other 14 had a depth of >/=2 mm. Of the 525 patients, 16 (3.0%) were identified as having a fossa navicularis in CT images. Evaluation of MRIs showed no soft tissue lesions in any of these patients. Comprehensive anatomic details of the fossa navicularis have not been reported in the literature. The results of this study may be useful to radiologists, anatomists, and surgeons interested in the skull base.

Bone Cysts↗

PubMed2002

Variations of supraorbital traits.

More than one notch and/or foramen may be found in the supraorbital region due to branching of the supraorbital nerves and vessels. A total of 360 adult Anatolian-Ottoman skulls (212 male, 148 female) were examined for some characteristics of the notches and/or foramina in the supraorbital region. The distribution of the supraorbital traits: 335 (93%) in medial, 24 (6.7%) in both medial and lateral, only 1 (0.3%) in lateral position. Of 360 skulls, 197 (54.7%) had one notch on either side, 32 (8.9%) had one foramen on one side and one notch on the other side, 24 (6.7%) had one foramen and notch on one side and one notch on the other side, 19 (5.3%) had one foramen on either side and 88 (24.4%) had other combinations. The distances of the notches from the midline, and between of the foramina from the midline and the supraorbital margin were measured. Knowledge of the anatomy of the supraorbital region is important for the plastic and maxillofacial surgery.

Female↗

PubMed1998

Various types of suprameatal spines and depressions in the human temporal bone.

Since it covers the lateral wall of the mastoid air system, the suprameatal triangle is of importance to otologic surgeons during mastoidectomy. Because of this clinical importance, topographic anatomy of the suprameatal spine and depression was studied on Anatolian skulls. In all, 363 male and 231 female skulls were studied. The most prevalent type of suprameatal spine resembled a crest and was found in both sexes on the right (77.6%) and left (80%) sides. The absence of a suprameatal depression was significantly higher in females (right 9.1%; left 8.7%) than in males (right 1.7%; left 2.5%). Suprameatal depressions were mostly shallow in female subjects, but were mostly observed in males to be at a medium depth or deep.

Female↗

PubMed1998

The incidence and localization of mastoid foramen and superficial parietomastoid canal and their relations with each other.

Mastoid foramen and some superficial bony canal on the outer surface of the mastoid region are of importance not only as an epigenetic variation but because of the vessels passing through it as well. On the other hand such a canal structure has not been described in classical anatomy textbooks. In this study, the presence, localization and number of both mastoid foramen and superficial bony canal and their relations with each other were studied in 358 male, 228 female, a total of 586 dry Anatolian skulls. The mastoid foramen was absent in 21.5% of the skulls. In its presence it was mostly seen on temporal bone. A superficial bony canal was observed in 45% of the skulls. Some correlations were also observed between the above mentioned structures.

Chi-Square Distribution↗

PubMed1997

Measurements of the carotid canal in skulls from Anatolia.

Since widespread applications of microsurgery are being employed for aneurysms, clival tumors, etc., precise knowledge of the skull base measurements has become vital, and a study of 307 adult skulls--130 female and 177 male--has been undertaken. Measurements were made between the landmarks chosen in accordance with the study of Lang in 1983 and our average values were similar to his series, being closer to his female data. There was no significant difference between the right and left sides of the skull.

Adult↗

PubMed1996

Neurocranial morphology as determined by asymmetries of the skull base.

The goal of the current study was to provide an easy to use criterion to diagnose neurocranial asymmetries. An anatomical survey of the external aspect of the skull base was planned to correlate with radiological studies. In a sample of 239 skulls, variations of the angular relationship between the structures seen on a basilar view of the cranium were analysed. An anterior and a posterior transverse line were plotted with respect to the midline. Departures from 90 degrees to the midline for either of the transverse lines were less than 5 degrees in normal skulls, between 5 degrees and 7 degrees in skulls classed by independent inspection as asymmetric, and more than 7 degrees in obviously malformed skulls.

Adult↗