The three vessels on the aortic arch are, respectively, from right to left, the cephalic trunk artery, the left common carotid artery, and the left subclavian artery. All three arteries in the aortic arch are located anterior to the trachea and esophagus, posterior to the sternal stalk, and parallel to the second right sternal rib joint, that is, parallel to the sternal angle. These three vessels have different directions, with the cephalobrachial trunk artery going up from the right side and dividing again into the right internal carotid artery and the right external carotid artery. The cephalobrachial trunk artery supplies blood to the right cerebral hemisphere and the right side of the face, the left common carotid artery supplies the left cerebral hemisphere and the left side of the face, and the left subclavian artery supplies the left upper arm and the armpit. All three arteries may be complicated by coronary heart disease, pulmonary embolism, and acute cerebral infarction if there is plaque formation and dislodgement.