MUSCLES OF THE THORACIC LIMBS. 



163 



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



75. ^)- 



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. 7<SJ\ 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, ^) 

 over a small area near the gleno- 

 vertebral angle of the scapula. 

 It may touch the insertion of the 

 rhomboideus. 



Insertion {^' 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, 



g) and the long portion (Fig. 



80, /) of the caput mediale of 



the triceps, the latissimus dorsi 



(Fig. 77, e), and the cutaneus 



maximus. Inner surface with 



the serratus anterior (Fig. 73, /), 



the scalenus (Fig. 73, /), the 



transversuscostarum(Fig. 73,j), 



and the biceps (Fig. 77, g). 



Dorsal border with the subscapu- scapula; <?, M. rhomboideus; /, M. oc- 

 1 . /T--- \ \ • r • cipitoscapularis; p; M. biceps; /i, M. 



lans (Fig. 77, a) and infraspina- coracobrachialis; I, caput lo.lgumofM. 



tus (Fig. 75, e). 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. 



(7, M subscapularis; b, M. teres major; 

 c, M serratus anterior; </, M. levator 



