Anatomy Circle of willis is formed by A Anterior cerebral artery, posterior communicating artery, middle cerebral artery, posterior cerebral artery, internal carotid artery B Anterior cerebral artery, posterior communicating artery, internal carotid artery, anterior communicating artery, middle cerebral artery. C Anterior communicating artery, posterior communicating artery, internal carotid artery, anterior inferior cerebellar artery, anterior cerebral artery. D Anterior communicating artery, posterior communicating artery, internal carotid artery, posterior cerebral artery, anterior cerebral artery. 💡 Explanation Circle of willis is formed by ✓ Correct Answer: D. Anterior communicating artery, posterior communicating artery, internal carotid artery, posterior cerebral artery, anterior cerebral artery.