<prompt> POSTERIOR COMMUNICATING aery is a branch ofVeebral aeryInternal carotid aeryExternal carotid aeryBasillary aery  <response>: Posterior communicating aery is a branch of cerebral pa of internal carotid aery. It arises close to its termination. It runs backwards and anastomoses with proximal pa of posterior cerebral aery.Reference: Textbook of anatomy, Head neck, and brain, Vishram Singh, 2nd edition, page no.406 