Variation of the arteries of the base of the brain in sheep.
D000818:Animals; D001488:Basilar Artery / Q000033:anatomy & histology*; D001921:Brain / Q000098:blood supply*; D002531:Cerebellum / Q000098:blood supply; D002536:Cerebral Arteries / Q000033:anatomy & histology*; D002941:Circle of Willis / Q000033:anatomy & histology; D012756:Sheep / Q000033:anatomy & histology*