506 



SAXGL'IFEROUS SYSTEM. 



directly or separately from the arch of the aorta, are those of 

 the left side, the left subclavian and the left carotid, as 

 might be inferred from their greater distance from the heart, 

 the prime mover of the circulation. 



FIG. 142. 



There is great uniformity in the distribution of these aortic 

 trunks in man and the inferior mammalia, as in the structure 

 of the organs which they supply. The common carotid 

 (142. A. k. i.) on each side divides, at the side of the larynx, 

 into an external and an internal carotid artery, without 

 giving any branch from the common trunk. The external 



