Bird, vessels (Gross, Medium)

Structure List Descending aorta Brachiocephalic trunks Subclavian arteries Common carotid arteries Heart Branching of aortic arches

Using the charts provided and the vascular casts, identify the vessels. The aortic arches of mammals show what major differences compared to fish and birds? In mammals and birds, half of the arches (1,2,&5) have been lost. The mammalian aorta is from the left 3rd arch with a single right brachiocephalic artery. The bird retains the right 3rd arch as the aorta and has 2 symmetric brachciocephalic branches.