THE ARTERIES. 285 



Sternothyroid (2) and sternohyoid (1) muscles. A small 

 branch, the superior laryngeal, passes to the larynx, and 

 supplies those muscles of the larynx which are not enclosed 

 by the cartilages. 



3. Rami musculares {e). — One or two branches, usually of 

 considerable size, leave the common carotid at about the same 

 level as the superior thyroid and pass to the muscles on the 

 dorsal side of the neck, the main trunk of the artery passing 

 between the longus capitis (7) and scalenus muscles (10). 



4. A. occipitalis (/). — -The occipital artery arises from the 

 common carotid at about the same point as the internal carotid. 

 It immediately sends a large branch dorsad, passing between 

 M. longus capitis (7) and the vertebral column, to the deep 

 muscles of the neck. The occipital then crosses the outer 

 surface of the digastric muscle (8) to the back of the skull, and 

 runs along the lambdoidal crest just beneath the splenius 

 muscle. It sends a number of branches to the muscles of the . 

 back of the neck; and one of its branches^may unite with the /^^ 

 vertebral artery as it lies in the groove on the atlas, or with a ''-<■■/' 

 branch of the vertebral. ^ ^"^^ 



5. A. carotis interna {g). — ;The internal carotid artery is 

 one of the terminal branches of the common carotid. It is very 

 small. It is given off near or in common with the occipital 

 artery, passes toward the cranial end of the tympanic bulla, 

 enters the bulla with the Eustachian tube, and passes into the 

 skull at the foramen lacerum. Its course is much convoluted 

 before entering the foramen. Within the skull (Fig. 121, g) 

 it joins the posterior cerebral artery (Fig. 121,/) at the side 

 of the hypophysis. 



6. A. carotis externa (Fig. 119, m). — After giving off the 

 internal carotid the continuation of the common carotid artery 

 receives the name external carotid (;;/)• It passes craniad and 

 laterad between the digastric (s) and styloglossus muscles, 

 where it gives off cranio ventrad the lingual artery (z) and a 

 number of small muscular branches; also sometimes the small 

 laryngeal artery. At the dorsolateral border of the digastric 

 (8) it gives off the external maxillary artery (7), and about one 

 centimeter farther craniad the posterior auricular {o). It now 



