(anatomy) The third major branch of the abdominal aorta, supplying the distal one-third of the transverse colon, descending colon, sigmoid colon and the proximal part of the rectum, i.e. the organs of the hindgut.

plural of posterior spinal artery

plural of anterior cerebral artery

plural of middle cerebral artery

(pathology) A gastrovascular disorder where part of the duodenum is under compression from both the abdominal aorta and the superior mesenteric artery.

(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) 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.

(anatomy) A branch of the maxillary artery that supplies the upper molar and bicuspid teeth.

(anatomy) Either of usually two arteries of which one arises from the ophthalmic artery on each side of the optic nerve, passes forward along the optic nerve accompanying the short posterior ciliary arteries, pierces the sclera passing forward on the same side of the eyeball between the sclera and the choroid to the ciliary muscle, and at the junction of the ciliary process and the iris divides into upper and lower branches which anastomose with the branches of the contralateral artery to form a ring of arteries around the iris.

(anatomy) Any of 6 to 10 arteries that arise from the ophthalmic artery or its branches, pass to the posterior part of the eyeball while surrounding the optic nerve, and enter or divide into branches entering the sclera to supply the choroid and the ciliary processes.