Abstract: The anatomy of cerebral vasculature of Mongolian gerbils was compared with those of hamsters and Sprague-Dawley rats through vascular casting method. The results verified the unique anatomical characteristics of cerebral vasculature of the mongolian gerbil that is lack of posterior communicating arteries connecting carotid and vertebro-basilar systems, resulting in an incomplete circle of Willis.

Key words: Mongolian Gerbil, Hamster, Rat, Comparative Anatomy, Circle of Willis