A morphological study on the V2 segment of the vertebral artery.

Morphometric investigations on the V2 segment of the vertebral artery, showed that, it did not have a constant calibre during its course within the foramina transversaria. The vertebral artery, entering the foramina transversaria reduced its calibre and further continued to reduce until C3 level, above C3 it began to reincrease its calibre and at C1 level reached its largest calibre. Measurements on the muscular thickness, showed an increase as ascending through the foramina transversaria. The widening and narrowing of the vertebral artery within the foramina transversaria was attributed as tortious artery or congenital anomaly. This study showed that it was the normal anatomy of the artery within the foramina transversaria.