Term Name:	circle of Willis
Synonyms:	arterial circle, arterial circle of Willis, cerebral arterial circle, circulus arteriosus cerebri, Willis circle
Definition:	A circle of arteries that supply blood to the brain. The Circle of Willis comprises the following arteries: Anterior cerebral artery (left and right); Anterior communicating artery; Internal carotid artery (left and right); Posterior cerebral artery (left and right); Posterior communicating artery (left and right).The basilar artery and middle cerebral arteries, supplying the brain, are also considered part of the circle
Ontology:	Uberon Ontology [UBERON:0003709]