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The Circle of Willis is the joining area of several arteries at the bottom (inferior) side of the brain. At the Circle of Willis, the internal carotid arteries branch into smaller arteries that supply oxygenated blood to over 80% of the cerebrum.

Review Date: 4/15/2001 12:00:00 AM Reviewed By: Galit Kleiner-Fisman, M.D., Department of Neurology, Beth-Israel Deaconess Medical Center, Boston, MA. Review provided by VeriMed Healthcare Network.

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