LIGAMENTS AND MUSCLES OF THE HORSE. 43 



1. SUBSCAPULARIS. 



Origin. — From the fossa of the same name. 

 Insertion.— To the internal trochanter of the humerus. 

 Action. — To adduct the shoulder. 



2. Teres internus. 



riy in. — Yrom. the dorsal angle of the scapula. 

 Insertion. — To the internal tubercle of the humerus. 

 Actio7i.—Jt flexes the shoulder and rotates it inwards. 



3. CORACO-HUMERALIS. 



Origin.- From a small tubercle on the inner side of the cora- 

 coid process of the scapula. 



Insertion. — To the inner surface of the humerus above the in- 

 ternal tubercle, and to a line a little lower down and 

 more anterior. 



Action — To adduct and flex the shoulder. 



4. SCAPULO-HUMERALIS POSTICUS. 



Origin. — Just above the rim of the glenoid cavity. 



Insertion. — To the posterior surface of the humerus just below 



the head. 

 Act' on. — To tense the capsular ligament and prevent its injury 



during flexion of the joint. 



ANTERIOR BRACHIAL REGION. 



1. Flexor brachii (or Coraco-radicdis). 



2. Humeralis ohliquns [or exte^'nus). 



1. Flexor brachii. 



Origin. — From the'coracoid process of the scapula. It emerges 

 between the two tendons of the antea-spinatus, and passes 

 over the bicipital groove to its 



Insertion. — To the bicipital tuberosity of the radius. 



Action. — To flex the elbow and extend the shoulder. 



2. Humeralis obliquus. 



Origin. — From the posterior surface of the humerus just below 

 the head. 



