innominate artery, one of the three arteries branching from the arch of the aorta, running about 5 cm from the level of the cranial border of the second right costal cartilage; ascending cranially, dorsally, and obliquely to the right; and dividing into the right common carotid and the right subclavian arteries. Also called brachiocephalic artery, brachiocephalic trunk.
