arteries are located on either side of the neck and head and deliver blood from the heart to the head. They are visible under the skin of the neck and their pulse rate can be felt. The common carotid or left primitive artery
leaves from the aorta
, while the right common carotid artery comes from an arterial trunk from the aorta. Each split into two, the internal carotid artery goes to the brain and the external carotid artery supplies mainly the face. A narrowing of the carotid artery decreases blood flow, especially to the brain: these partial stenoses are looked for during a Doppler examination called an ultrasound of the supra-aortic trunks, frequently practiced in people at risk.