MUSCLES OF THE THORACIC LIMBS, 



163 



with 



75- 



the teres major (Fig. 77, c) and infraspinatus (Fig. 



Action. Pulls the humerus inward (mediad). 



M. teres major (Fig. 75, d; Fig. 77, c\ A thick muscle, 

 triangular in cross-section, lying parallel with the glenoid border 

 of the scapula. 



Origin (Fig. 76, /; Fig. 78, <) from the vertebral one-third 

 of the glenoid border of the scapula, and from fascia covering 

 the subscapularis (Fig. 77, a) 

 and the infraspinatus (Fig. 75, c) 

 over a small area near the gleno- 

 vertebral angle of the scapula. 

 It may touch the insertion of the 

 rhomboideus. 



Insertion (Fig. 82, /") by a 

 tendon common to it and the 

 latissimus dorsi (Fig. 79, d'], as 

 already described. 



Relations. Outer surface 

 with the caput longum (Fig. 75, 

 ) and the long portion (Fig. 

 80, /) of the caput mediate of 

 the triceps, the latissimus dorsi 

 (Fig. 77, e), and the cutaneus 

 maximus. Inner surface with 

 the serratus anterior (Fig. 73, i ), 

 the scalenus (Fig. 73, /), the 

 transversus costarum (Fig. 73,/), 

 and the biceps (Fig. 77, P-). 



/ i, ATA atnatua UIIL^IIUI , , ivi. icvttLUl 



Dorsal border with the subscapu- scapulae; e, M. rhomboideus; /, M. oc- 



laris (Tip- 77 a\ and infr^nina ci P itosca P u i aris : & M. biceps; A, M. 

 ^g- 77 J anc Itraspma- cor acobrachialis; t, caput longum of M. 



tus (Fig. 75, c]. triceps. 



Action. Rotates the humerus inward and flexes it in oppo- 

 sition to the infraspinatus, teres minor, and the deltoidei. 



FIG. 78. MEDIAL SURFACE OF THE 

 SCAPULA WITH THE AREAS OF 

 ATTACHMENT OF MUSCLES. 

 rt, M. subscapularis; b, M. teres major; 

 M serratus anterior; d, M. levator 



