★ Common carotid a. Origin(arises from a Brachiocephalic trunk on the right o Aortic arch on the left Ascends in neck to upper border of thyroid cartilage; bifurcates into internal and external carotid arteries★ Common carotid a. ◼ Origin (arises from) ❑ Brachiocephalic trunk on the right ❑ Aortic arch on the left ◼ Ascends in neck to upper border of thyroid cartilage; bifurcates into internal and external carotid arteries