282 



THE CIRCULATORY SYSTEM. 



2. A. anonyma(Fig. 115,7'; ^'S- ^^^y ^')- — Theinnominate 

 artery passes craniad from the convexity of the aortic arch [a'). 

 It gives rise first to a small mediastinal artery (;//) which 



passes ventrad into the mediastinum, then^to tlie left common 

 carotid (Fig. 115, /), then to the right common carotid (Fig, 

 115, in). Sometimes the carotids are given off from a common 

 trunk. Beyond the riglit common carotid the innominate is 

 continued as the right subclavian (Fig. 115, w). 



