2 8 EQUINE Anatomy 4 



The into'iial or bicipital tuberosity, 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 shows — 



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 anter- 

 ior extensors of the phalanges and 7netacarpns ; the internal 

 oblique one, the oblique extensor. 



A strongly marked ridge behind, for hgaments. 



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 exlenial smooth, internal co)icave, 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. 



