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Arterial Circle, Cerebral

A polygonal anastomosis at the base of the Brain formed by the internal carotid (Carotid Artery, Internal), proximal parts of the anterior, middle, and Posterior Cerebral Arteries (Anterior Cerebral Artery; Middle Cerebral Artery; Posterior Cerebral Artery), the anterior communicating Artery and the posterior communicating Arteries.