194 



ANATOMY AND PHYSIOLOGY 



PRINCIPAL ARTERIES OF THE HEAD AND NECK 



The common carotid arteries. (Fig. 127). The right is a 

 branch of the anonyma; the left is directly from the arch of the 

 aorta. They proceed upward on either side of the trachea, with 

 the internal jugular vein on the lateral side and the vagus nerve 

 behind them. They carry the blood supply of the head and neck. 



The common carotid divides at the upper border of the thyroid 

 cartilage into internal carotid for the interior of the head, and 

 external carotid for the exterior of the head and the neck. 



FIG. 132. ARTERIES OF THE BRAIN. (Morris). 

 Cerebral arteries pass from the base of the brain to all parts of the surface. 



The internal carotid is deep in the neck; it runs up to the 

 head and through the carotid canal into the cranial cavity. 



Principal branches. Ophthalmic, to eye and appendages, nose, 

 and forehead. (The supraorbital artery is a branch of the 

 ophthalmic.) 



Middle cerebral to the brain, anterior cerebral to the brain 

 (Fig. 132). 



