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Address for Correspondence: Dr. M.Anuradha, Assistant Professor, Department of Anatomy, Stanley Medical College, Chennai, Tamilnadu, India. E-Mail: dranurac@yahoo.com Background: The jugular foramen, the bony opening is situated in the base of skull. It allows passage of important nervous and vascular elements, such as the glossopharyngeal, vagus, accessory nerve and the internal jugular vein. Most of the approaches for skull base surgeries are designed to drill the bone around jugular foramen for proper exposure. Therefore the knowledge of anatomical variations of jugular foramen is important. Material and Methods: A total of 100 jugular foramina were examined from 50 adult dry skulls in the department of anatomy, Stanley Medical College, Chennai, Tamilnadu, India. Results: The mean anteroposterior diameter of the jugular foramen on the right and left were 12.11mm and 11.09mm; the mediolateral diameter were 15.06mm and 14.02mm on the right and left respectively. In 63% of cases the right foramina were larger than the left, in 12% of cases the left foramina were larger than the right and in 25% cases they were equal in size on both sides. The septation in the jugular foramina on the right and left side was 35% and 31% respectively. Complete septation was present in 17% on the right side and 17% on the left side. Partial septation was present in 17% and 12% on the right and left side respectively. Conclusion: Glomus tumour, schwannomas, metastatic lesions and infiltrating inflammatory processes can also occur in the jugular foramen. Hence, a detailed knowledge of the jugular foramen is important for neurosurgeons and radiologists dealing with space occupying lesions in jugular foramen.

A STUDY OF THE MORPHOLOGY AND MORPHOMETRY OF THE JUGULAR FORAMEN OF THE HUMAN DRY SKULLS