Systematization, Description and Territory of the Middle Cerebral, Rostral and Cerebroethmoidal Arteries on the Surface of the Brain of the Ostrich (Struthio camelus).

Thirty ostrich specimens were injected with red-dyed latex via the internal carotid arteries (Aa.) The middle cerebral and cerebroethmoidal arteries and their branches were systematized. The middle cerebral artery (a.) was always a single large vessel. On the right side, it had two, three or one developed medial hemispheric branches in 46.6%, 26.7% and 26.7% of cases, respectively. On the left side, one (36.7%), two (33.3%) and three (30%) developed medial hemispheric branches were observed. The middle cerebral artery had eight (40%), nine (20%), seven (16.7%), eleven (6.7%) ten (6.7%), twelve (3.3%), six (3.3%) and five (3.3%) developed lateral hemispheric branches on the right side and seven (46.7%), nine (13.3%), eight (13.3%), six (10%), five (10%) and ten (6.7%) on the left. Two (33.3%), four (20%), three (20%), one (16.7%) and five (10%) direct perforating branches of the middle cerebral artery were present on the right, and three (33.3%), two (30%), one (13.4%), six (10%), four (10%) and five (3.3%) were present on the left. The cerebroethmoidal artery, always present as a natural continuation of the rostral terminal branch of the brain's carotid artery and originating from the middle cerebral artery, was a large vessel that projected rostromedially, giving off the rostral cerebral artery shortly after its formation and continuing as the ethmoidal artery. The rostral cerebral artery was a single (90%) and double (10%) vessel on the right and a single (96.7%) and double vessel (3.3%) on the left. The ethmoidal artery was always a medium to large single vessel and was the natural continuation of the cerebroethmoidal artery, immediately after giving off the rostral cerebral artery. This article is protected by copyright. All rights reserved.