Anterior circulation

Last revised by Craig Hacking on 15 Aug 2022

The anterior circulation is the blood supply to the anterior portion of the brain, including most of the supratentorial structures excluding the occipital lobes.

The anterior circulation is supplied by the internal carotid arteries which each divide into two the large terminal branches, the anterior cerebral and middle cerebral arteries. Due to the anastomotic circle of Willis, the anterior circulation connects via the posterior communicating arteries to the posterior circulation.

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