BRANCHES OF THE SUBCLAVIAN ARTERY. 



525 



ular. In its passage across the neck it crosses in front of the phrenic nerve, Sca- 

 leni muscles, and the brachial plexus, between the divisions of which it sometimes 

 passes, and is covered by the Platysma, Sterno-mastoid, Omo-hyoid, and Trapezius 

 muscles. 



Scalenns 

 anticus 



Thyroid axis. 



Common carotid. 

 Innominate. 



Internal mam- 

 mary. 



Anterior intercostal 

 branches. 



Perforating 



branches. 



Musculo- 

 phrenic. 



Superior epi- 

 gastric. 



FIG. 301. -The internal mammary artery and its branches. 



The superficial cervical ascends beneath the anterior margin of the Trapezius, 

 distributing branches to it and to the neighboring muscles and glands in the neck, 

 and anastomoses with the superficial branch of the arteria princeps cervicis. 



