Anatomy General anatomy 12286ac3 Which of the following are unpaired vessel in CNS? A Anterior-cerebral aery B Basilar aery C Posterior- Cerebellar aery D Posterior-communicating aery High-Yield Explanation Basilar aery is single unpaired vessel, formed by right &left veebral aeries at lower border of pons, Ref: Gray's40e/p-262