AXILLARY ARTERY. 



trunks of nerves into which the brachial plexus has been resolved. 

 On the outer side is the median nerve, with the niusculo-cutaneous 

 for a short distance ; and on the inner side are the uliiar and the 

 nerve of Wrisberg (lesser internal cutaneous), the latter being 

 directed behind, or sometimes through, the vein to its inner side. 

 Superficial to the vessel is the internal cutaneous and the inner 

 head of the median passing outwards ; and behind are the musculo- 

 .spiral and circumflex nerves, the latter extending only as far as the 

 border of the subscapular muscle. 



The BRANCHES of the axillary artery are furnished to the wall of BRANCHES. 

 the thorax and the shoulder. The thoracic branches are, as a rule, 

 four in number ; two (superior and acromio-thoracic) arise from the 



External anterior thoracic nerve. 



Cephalic vein 

 Musculo-cutaneous nerve. 



Anterior circumflex 

 artery. 



Posterior circumflex 

 artery. 

 Coraco brachialis. 



Internal 



cutaneous nerve. 

 Subscapular 

 artery. 

 Intercosto- 

 humeral nerve. 

 Median nerve. 



Ulnar nerve. 

 Teres major. 



Brachial 

 plexus. 



Axillary 

 artery. 



Axillary vein. 

 Thoracic axis. 



Long subscapu. 

 lar nerve. 

 Lowest sub- 

 scapular nerve. 

 Internal ante- 

 rior thoracic 

 nerve. 



Long thoracic 

 artery. 



Serratus magnus. 



FIG. 7. PARTS BENEATH THE PECTORALIS MAJOR (DIAGRAMMATIC). 



artery above the pectoralis minor, one (alar thoracic) beneath that 

 muscle, and one (long, or inferior, thoracic) at its lower border. 

 Three branches are supplied to the shoulder, viz., subscapular and 

 two circumflex ; they arise close together, at the border of the 

 subscapularis muscle. Occasionally a . small external mammary 

 artery is present. 



The superior thoracic branch is the highest and smallest offset, and Upper 

 arises opposite the first intercostal space ; it ramifies on the side of 

 the chest, anastomosing with the intercostal arteries. Very com- 

 monly this vessel arises with the acromio-thoracic. and the trunk of 

 origin is then spoken of as the thoracic axis (fig. 7). 



The acromio-thoracic branch is a short trunk on the front Acromio- 

 thoracic 



