<Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <P> In human anatomy, the anterior communicating artery is a blood vessel of the brain that connects the left and right anterior cerebral arteries . </P> <P> 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 . </P> <P> It is part of the cerebral arterial circle, also known as the circle of Willis . </P>

Where is the anterior communicating artery in the brain