338 THE HORSE. 
prominent internal lateral process, and one less distinct on the outside 
marked with a groove. 
Toe vuLNa (or ulnar division of the 
os brachii) is much shorter than the 
radius, and can scarcely be considered 
as having two extremities, its lower end 
being cut off in an oblique direction and 
terminating in a sharp point, so as to look 
like a splicing of the one bone to the other. 
It may be considered as consisting of a short 
body (2, Fig. 26), surmounting which is the 
olecranon process (3) behind, and the arti- 
cular surface (4) in front. Descending from 
the body is the thin wedge of bone which 
is united indissolubly with the shaft of the 
radius at the point marked (5), and may be 
traced down to the carpal joint. 
The articular surface comprises part of 
the elbow joint, and has below it some 
roughened inequalities for the attachment 
of ligaments. 
The olecranon process, or elbow, is of 
considerable size and strength, forming a 
strong lever for the action of the triceps 
muscle, which is inserted in its point. Its 
anterior edge has a sharp point, which 
deepens the articular cavity, and checks the 
motion of the joint from being carried too 
far. 
Fia. 26.—Bowes OF THE Forr-ARM, KNEE, CANNON, 
PASTERNS, AND Foor. 
1. Semicircular fossa formed by the radius and ulna for 
the elbow joint. 
2. Body of the ulna. 
3. Olecranon process. 
4. Articulating surface. 
5. Body of the radius. 
6. Surface articulating with the condyle of the humerns. 
7. Tubercle to which the coraco-radialis muscle is 
attached. 
8. Articulatory surfaces corresponding to the upper row 
of knee-bones. 
9. Os pisiforme. 
10. — cuneiforme, 
11. — lunare. Bones of the knee. 
11. — unciforme. 
3. — magnum. 
14. Metacarpus or cannon-bone. 
15. External small metacarpal bone. 
16. Tubercle to which the tendon of the muscle (extensor 
metacarpi magnus) is attached. 
17. Joint uniting with the os sulfraginia, 
18. Os suffraginis. 
19. External sesamoid bone, 
20. Os corone. 
21. Os pedis. 
22. 22. Wings of pedal bone. 
°3 Os naviculare. 
