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In this lecture Professor Zach Murphy will be presenting on the arterial supply to the brain, which is also referred to as the circle of willis. We are looking at this diagram in an inferior view and branch out from the internal carotid feeding the anterior portion of the brain, and the vertebrobasilar system which is supplying the posterior portion of the brain. Finally, we look at each artery that forms the circle of willis including the anterior cerebral artery, the anterior communicating artery, the middle cerebral artery, the posterior cerebral artery, and the posterior communicating artery.