| Definition of 'circle of willis' |
Princeton's WordNet |
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1. (noun) circle of Willis
a ring of arteries at the base of the brain
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| Definition of 'circle of willis' |
U.S. National Library of Medicine |
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1. circle of willis
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.
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Definitions of circle of willis 
