human_reference_atlas part of has part blood vessel endothelial cell Homo sapiens anterior cerebral artery communicating artery anterior communicating artery http://upload.wikimedia.org/wikipedia/commons/2/2e/Circle_of_Willis_en.svg uberon Wikipedia:Anterior_communicating_artery EMAPA:18599 anterior communicating artery anterior communicating artery SCTID:181311009 UBERON:0006764 A blood vessel of the brain that connects the left and right anterior cerebral arteries. The anterior communicating artery connects the two anterior cerebral arteries across the commencement of the longitudinal fissure. Sometimes this vessel is wanting, the two arteries joining together to form a single trunk, which afterward divides; or it may be wholly, or partially, divided into two. Its length averages about 4 mm, but varies greatly. It gives off some of the anteromedial ganglionic vessels, but these are principally derived from the anterior cerebral artery. It is part of the cerebral arterial circle, also known as the circle of Willis. AS arteria communicans anterior FMA:50169 NCIT:C32087 EHDAA2:0000586 UMLS:C0149562