398 THE HORSE. 
POSTERO-INTERNAL SCAPULAR REGION. 
TERES INTERNUS VEL MAJOR is situated upon the posterior part of the 
shoulder. Origin—from the inner surface of the supero-posterior angle 
and from a slight indentation internally placed to the posterior border of © 
the scapula. Znsertion—to the rough tubercle on the inner side of the 
body of the humerus, in company with the latissimus dorsi. A ction—to 
draw the humerus inwards. 
ScaPuLo ULNARIS lies upon the posterior part of the shoulder. Origin— 
from the supero-posterior and inner part of the scapula, extending from 
x 
Fic. 4.—INtTeERNAL VIEW OF THE Muscles OF THE SHOULDER AND ARM. 
13 
Teres internus vel major. 1t. Flexor metacarpi internus. 
. Insertion of latissimus dorsi. 15. Flexor metacarpi medius. 
. Triceps extensor brachii (caput magnum). 
a. a. Cartilage at the base of the scapula. 9. Coraco humeralis. 
1. Insertion of serratus magnus turned up. 10. Insertion of pectoralis. 
2. Insertion of rhomboideus longus. 11. Flexor brachii. 
3. Insertion of rhomboideus brevis. 12. Triceps extensor brachii (caput tertium). 
4. 5. Subscapularis. 3. Extensor metacarpi magnus. 
6. 
7 
8 
its angle to just above its glenoid cavity. Znsertion—to the olecranon and 
to the postero-internal part of the ulna, extending from its summit to where 
the ulna joirs the radius, Action—to assist the caput magnum of the 
triceps. 
