It was observed that the bony bars between the three clinoid processes can be divided into four types (Types I, II, III, IV). Due to the presence of these bars three types of interclinoid foramina were formed. A total incidence of 22% of various types of interclinoid bars was observed, out of which 12% were Type I, 5.6% Type II, 4% type III and only 0.4% were of type IV variety.

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Background: Morphometric analysis of the foramen magnum of dry human skulls in North Indian population was carried out to demonstrate the anatomical variations in morphology. The dimensions of the foramen magnum are clinically important because vital structures passing through it may endure compression in diseases associated with foramen magnum like herniation, meningiomas and achondroplasia.