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communicating artery

n :  any of three arteries in the brain that form parts of the circle of Willis  a  :  one connecting the anterior cerebral arteries - called also anterior communicating artery   b  :  either of two arteries that occur one on each side of the circle of Willis and connect an internal carotid artery with a posterior cerebral artery - called also posterior communicating artery  .
 
 

 
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