MUSCLES OF THE THORACIC LIMBS. 163 
with the teres major (Fig. 77, ¢) 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. 76, 7; Fig. 78, 6) from the vertebral one-third 
of the glenoid border of the scapula, and from fascia covering 
the subscapularis (Fig. 77, @) 
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. ps: 
Insertion (Fig. 82, f) by a AN 
tendon common to it and the 
latissimus dorsi (Fig. 79, @’), as 
already described. 
Relations. — Outer surface 
with the caput longum (Fig. 75, 
g) and the long portion (Fig. 
80, 7) 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, 2), 
Fic. 78.—MEDIAL SURFACE OF THE 
the scalenus (Fig. 735 SJ) the SCAPULA WITH THE AREAS OF 
transversus costarum (Fig. 73,7), ATTACHMENT oF Muscles. 
ss : a, M. subscapularis; 4, M. teres major; 
and the biceps (Fig. 77) &): c, M serratus anterior; d, M. levator 
Dorsal border with the subscapu- scapulz; ‘ M. preci. ‘A ue 
. A : : cipitoscapularis; g, M. biceps; . 
laris (Fig. 77> a) and infraspina- coracobrachialis; z, 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. 
