circle of Willis

circle of Willis definition - medical

circle of Wil·lis (wĭlˈĭs)

noun
A roughly circular anastomosis that is located at the base of the brain and formed by the anterior communicating artery, the two anterior cerebral, the two internal carotid, the two posterior communicating, and the two posterior cerebral arteries.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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