376 



THE MUSCULAK SYSTEM. 



larger tubercle of the humerus and into the capsule of the shoulder-joint, and, by 

 fleshy fibres, into the posterior aspect of the surgical neck and body of the humerus 

 distal to the tubercle for about an inch (Fig. 341, p. 380). 



It is separated from the teres major by the long or scapular head of the triceps 

 brachii, and by the posterior circumflex vessels of the humerus and the axillary 



nerve. Its origin is pierced by the circumflex 

 scapular artery. The muscle is invested by the 

 deep fascia enclosing the infraspinatus, and is 

 OnsertTn) aris sometimes inseparable from that muscle. 



Nerve-Supply. The teres minor is supplied by a branch 

 of the axillary nerve (C. 5. 6.). The nerve has a pseudo- 

 ganglion, a fibrous swelling on it in its course to the muscle. 



Action. The muscle is a lateral rotator of the humerus. 



Supraspinatus 

 (insertion) 



Pectoralis major 

 " (insertion) 



Latissimus dorsi 

 (insertion) 



Teres major 

 (iiisertion) 



Deltoid 

 (insertion) 



Coracobrachialis 

 (insertion) 



M. Teres Major. The teres major is much 

 larger than the preceding muscle. It arises by 

 fleshy fibres from the lower third of the flat surface 

 on the dorsum of the scapula along its axillary 



Brachioradialif 

 (origin)' 



Extensor carpi 

 radialis longus 

 (origin) 



Common tendon 

 for origin of 

 pronator 

 teres and flexor 

 muscles of 

 forearm 



Common tendon for origin of 

 extensor muscles of forearm 



FIG. 336. MUSCLE - ATTACHMENTS TO 



THE ANTERIOR ASPECT OF THE RIGHT 



HUMERUS. 





Deltoid 

 (origin) 



Triceps 

 brachii 

 (origin of 

 long head) 



Teres minor 

 (origin) with gap 

 for circumflex 

 scapular artery 



Teres major (origin) 



Latissimus dorsi (origin) 



FIG. 337. MUSCLE- ATTACHMENTS TO THE RIGHT SCAPULA 

 (Dorsal Surface). 



margin (except for a small area at the inferior angle), and from fascial septa, which 

 separate it on the one side from the subscapularis, and on the other from the 

 infraspinatus and teres minor (Fig. 337). 



The muscle is directed along the axillary margin of the scapula to the front 

 of the body of the humerus, where it is inserted, by a broad flat tendon, into the 

 medial border of the sulcus intertubercularis medial to the latissimus dorsi muscle 

 (Fig. 337). Just before its insertion it is closely adherent to the tendon of the 

 latissimus dorsi. 



The teres major lies below the subscapularis muscle in the posterior wall of 



