<prompt> Common carotid aery bifurcation is atThyroid cailageCricord cailageC7T2  <response>: At the level of the upper border of the thyroid cailage, the aery ends by dividing into the external and internal carotid aeries. The right common carotid aery is a branch of the brachiocephalic aery. The left common carotid aery is branch of the arch of the aoa. Ref: BDC volume 3;sixth edition: pg 99 