28 EQUINE ANATOMY. 



The internal or bicipital tuber osity, for attachment of the coraco- 

 radialis. 



Below this, a transverse groove, for the short flexor of forearm. 



The coronoid process, a small projection anteriorly. 



Two facets, posteriorly, for the ulnar articulation. 



The inferior extremity show& 



Below, the articulating surface for the four upper carpus. 



Two tubercles for ligaments, externally and internally. 



Three grooves anteriorly, the two outer ones lodging the ante- 

 rior extensors of the phalanges' and metacarpus; the internal oblique 

 one, the obilque extensor. 



A strongly marked ridge behind, for ligaments. 

 Articulations, 6. 



Humerus, ulna, pisiform, cuneiform, semi-lunar and scaphoid. 



THE ULNA. 



The ulna is a long bone forming the posterior and upper three- 

 fourths of the forearm, and strongly united to the radius. 



It has a shaft, an upper and lower extremity. 



The shaft is triangular, and has 



An external smooth, internal concave, and an anterior rough 

 surface. The latter shows two facets and the ulnar groove for the 

 radio-ulnar arch. 



There are also two lateral, and a posterior rough, borders. 



The upper extremity shows 



A Superior enlargement, the olecranon process, for the attach- 

 ment of the extensors of the forearm. This has external convex 

 and internal concave surfaces. 



Its anterior portion shows a deep notch, the sigmoid cavity, for 

 articulation with the humerus, terminating above in the beak. 



The inferior extremity shows 



A, small knob, the capitellum, which sometimes reaches to the 

 end of the radius. 

 Articulations, 2. 



The humerus and radius. 



THE FORE-FOOT, OR HAND. 



This comprises in the horse the carpus, seven in number, three 

 metacarpus, three phalanges and three sesamoids. 



