(anatomy) An artery that arises from the internal carotid artery, forms the anterior portion of the circle of Willis where it is linked to the artery on the opposite side by the anterior communicating artery, and passes on to supply the medial surfaces of the cerebrum.

(anatomy) One of the three arteries in the brain that form parts of the circle of Willis; it connects the anterior cerebral arteries.

(anatomy) An artery supplying the deep structures of the face (as the nasal cavities, palate, tonsils, and pharynx) and sending a branch to the meninges of the brain.

(anatomy) An artery that arises by the terminal forking of the basilar artery where it forms the posterior portion of the circle of Willis and passes on to supply the lower surfaces of the temporal and occipital lobes.

(anatomy) An artery that arises from the internal carotid artery, passes along the lateral fissure, and supplies the lateral surfaces of the cerebral cortex.

(anatomy) 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.

(anatomy) Any of three arteries in the brain that form parts of the circle of Willis.

(anatomy) An artery that usually branches from the vertebral artery below its junction with the contralateral vertebral artery to form the basilar artery and that supplies much of the medulla oblongata, the inferior portion of the cerebellum, and part of the floor of the fourth ventricle.

(anatomy) Any of several branches of the basilar and vertebral arteries that supply the cerebellum.

(anatomy) An artery that arises from the basilar artery either alone or by a common trunk with the labyrinthine artery, divides into branches distributed to the anterior parts of the inferior surface of the cerebellum, and gives off a branch that anastomoses with the posterior inferior cerebellar artery.