VIII.] 



THE MUSCLES. 



293 



from the coracoid process, and is inserted on the inner side 

 of the humerus. 





FIG. 269. MUSCLES OF THE RIGHT SHOULDER-BLADE, viewed from behind. 

 i, supra-spinatus ; 2, infra-spinatus ; 3, teres minor ; 4, teres major ; 5, latissi- 



mus dorsi near its insertion ; 6, scapular head of triceps ; 7, external humeral 



head of triceps. 



The biceps is the well-known muscle used in flexing the 

 arm. It arises by two heads : one a long tendon from the 



7\ 





FIG. 270. INNER ASPECT OF SUPERFICIAL MUSCLES OF RIGHT SHOULDER- 

 BLADE AND UPPER ARM. 



i, subscapularis ; 2, teres major ; 3, scapular part of triceps ; 4, internal humeral 

 part of triceps-, ; 5, biceps ; 6, coracoid head and tendon of biceps, on the inner 

 side of which is a small muscle, the coraco-brachialis ; 7, humeral head and 

 tendon of biceps : 8, deltoid ; 9, cut end of pectoralis major, supported by a 

 hook, and shown to be folded on itself; 10, brachialis anticus. 



