plural of anterior pituitary gland

(anatomy) A muscle arising from the transverse processes of the third to sixth cervical vertebrae, inserting on the scalene tubercle of the first rib, and functioning to bend the neck forward and laterally and to rotate it to the side.

(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) A groove along the anterior midline of the spinal cord that incompletely divides it into symmetrical halves.

(anatomy) A single unpaired artery that is formed by the anastomosis of a branch of the vertebral artery on each side and that descends in the anterior median fissure of the spinal cord.

plural of anterior cerebral artery

(anatomy) A projection at the anterior end of the iliac crest.

(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.