MUSCLES ^ 37 



the lesser tuberosity and capsular ligament of the 

 head of the humerus. (Plate IV.) 



19. The Coraco-brachialis is a small muscle lying 

 on the inner side of the shoulder-joint and cover- 

 ing the insertion of the subscapularis muscle. It 

 is composed of two parts, both of which arise 

 from the coracoid process of the scapula and are 

 inserted on the inner side of the humerus, just 

 above the insertion of the teres major. (Plate IV.) 



20. The Biceps is a long, spindle-shaped muscle, 

 lying on the flexor (anterior) surface of the hu- 

 merus. It arises by a strong tendon from the 

 anterior margin of the glenoid cavity of the scap- 

 ula, and is inserted by a similar tendon on the tu- 

 bercle of the radius. (Plates III. and IV.) 



21. The Bjachialis Anticus Muscle lies closely 

 along the outer side of the anterior surface of the 

 humerus, below the insertion of the teres minor. 

 Its fibres converge to their insertion on and near 

 the coronoid process of the ulna. (Plates II. and 



in.) 



22. The Triceps is the large mass of muscle on 

 the extensor (posterior) surface of the humerus. 

 It consists of five parts, as follows : 



a. The largest division of the triceps arises by 

 a broad tendon from the lower half of the axillary 

 border of the scapula, between the subscapularis 

 and teres minor muscles. It is inserted by a 

 strong tendon on the olecranon process of the 

 ulna. (Plates II., III., and IV.) 



