378 



HUMAN ANATOMY. 



ternally, by the upper four ribs and intercostal and upper part of 

 serratus magnus muscles, and its apex is directed upward, and 

 is formed by the space between the first rib, clavicle, and upper 

 border of the scapula, and its base by the skin and axillary fascia 

 stretched across between the lower borders of the pectoralis 

 major and latissimus dorsi muscles. 



FIG. Ifi7. 



The axilla. 1, axillary artery; 2, brachial artery; 3, acromio- 

 thoracic artery; 4, superior thoracic artery; 5, subscapular artery; 6, 

 dorsalis scapulae artery; 7, posterior circumflex artery; 8, superior pro- 

 funda artery; 9, posterior thoracic nerve; 10, long subscapular nerve; 

 11, median nerve; 12, cephalic vein; 13, musculo-cutaneous nerve; 14, 

 teres major muscle. (Boenning.) 



It contains: 



The axillary artery and vein, and their branches; the 

 brachial plexus of nerves, and the branches given off below the 



