Biceps 



243 



simus clorsi and the dorsal surface of the inferior angle of the scapula. 

 Like other bursae, it is liable to attacks of chronic inflammation, and 

 to distension by accumulation of its fluid contents. 



The coraco-brachialis arises from the tip of the coracoid process 

 and is inserted halfway down the inner surface of the humerus, opposite 

 to the deltoid. It is supplied by the musculo-ctitaneous nerve, which 

 runs through it. 



Relations. It lies along the inner side of the biceps and the outer 

 side of the axillary and brachial artery. It is covered by the deltoid and 

 pectoralis major, and rests upon the muscles at the back of the axilla. 



The biceps arises by its short head with the coraco-brachialis, and 

 by its long head from the top of the glenoid cavity, the tendon spread- 

 ing out into the glenoid ligament. This tendon then winds over the 

 upper end of the humerus, strapping it in its place, and, passing 

 between the tuberosities, escapes beneath the Capsule It carries with 

 it a prolongation of the synovial membrane into the bicipital groove, 

 along which an abscess in the joint may find its escape. The two 

 heads of the muscle join below the middle of the arm. The insertion 

 is into the back of the tuberosity of the radius, and a bursa, which is 

 sometimes inflamed and filled with fluid, intervenes between the 

 front of the tuberosity and 

 the tendon. By this back- 

 ward insertion the biceps 

 becomes a powerful supi- 

 nator. Its nerve-supply is 

 from the musculo-cuta- 

 neous. 



From the inner side of 

 the tendon of the biceps 

 a strong slip, the bicipital 

 fascia, is given to join the 

 deep fascia over the muscles 

 arising from the inner con- 

 dyle. This fascia lies be- 

 neath the branches of the 

 internal cutaneous nerve, 

 and the median-basilic 

 vein, and separates them 

 from the subjacent brachial 

 artery, as shown on p. 237. 



Relations. Its upper 

 end is covered by the del- 

 toid and pectoralis major. 

 It rests on the muscles 

 which form the floor of the axilla, and on the brachialis anticus and 

 musculo-cutaneous nerve. Internally are the coraco-brachialis, median 



R2 



Osteo-arthritis ; biceps adhering to head of humerus. 



