186 THE UPPER EXTREMITIES. 



forearm and thence aiong its ulnar border to the palm 

 of the hand, where it divides into the deep branch and 

 the superficial palmar arch which supplies the four 

 digital arteries. 



From the axillary artery branches go to the chest 

 wall and shoulder, the most important being the two 

 circumflex arteries to the deltoid. The brachial has only 

 two branches of any importance, the superior and in- 

 ferior profunda, both on the upper arm, of course. 



In case of hemorrhage compression can frequently 

 be applied with the fingers where the subclavian crosses 

 the rib or in the axilla, where the artery can be pressed 

 up against the humerus. 



Nerves. The nerve supply of the shoulder comes 

 chiefly from the anterior and posterior thoracic, the 

 suprascapular , and the circumflex, these last going to 

 the deltoid. The biceps is supplied by the musculo- 

 cutaneous, the triceps by the musculo-spiral , and the 

 brachialis anticus by both. Most of the flexor and 

 pronator muscles are supplied by the median, while the 

 posterior interosseous and the musculo-spiral nerves go 

 to the extensors and supinators. The ulnar nerve sup- 

 plies the hand largely. 



