. The anatomy of the domestic animals. Veterinary anatomy. 96 THE SKELETON OF THE HORSE three facets for articulation with the third carpal bone. The dorsal and medial surfaces are continuous and bear a tuberosity to which the collateral liga- ment is attached. The distal surface is articular and consists of a large flattened facet for the second or inner metacarpal bone, and a small one for the third or large metacarpal bone. Some specimens have a small facet on the lower part of the volar surface which articulates with the first carpal bone. S The Third Carpal Bone The third carpal bone (Os
. The anatomy of the domestic animals. Veterinary anatomy. 96 THE SKELETON OF THE HORSE three facets for articulation with the third carpal bone. The dorsal and medial surfaces are continuous and bear a tuberosity to which the collateral liga- ment is attached. The distal surface is articular and consists of a large flattened facet for the second or inner metacarpal bone, and a small one for the third or large metacarpal bone. Some specimens have a small facet on the lower part of the volar surface which articulates with the first carpal bone. S The Third Carpal Bone The third carpal bone (Os carpale tertium)' is much the largest bone of the distal row, forming more than two-thirds of the width of the latter. It is flattened from above downward, and is twice as wide in front as behind. The proximal surface consists of two facets separated l)y an antero-pos- terior ridge; the medial facet is concave and articulates with the radial carpal; the lateral facet— for the intermediate carpal—is concave in front and convex be- hind, where it encroaches on the volar surface. The distal surface is slightly undulating, and articu- lates almost entirely with the third or large metacarpal bone, but it usually bears a small oblique facet at its medial side for the second metacarpal, and there is commonly a non-articular depression later- ally. The medial surface faces liackward and inward, and bears three facets for articulation with the second carpal, between which it is excavated and rough. The lateral surface has two facets for articulation with the fourth car- pal, and is depressed and rough in its middle. The dorsal sur- face is convex and is crossed by a rough transverse ridge. The volar surface is relatively small, and is rounded; its upper part. Fig. 72.—Left Caepcs of Horse, -niTH Parts of Adjacent Bones; Medial View. Cr, Radial carpal; Ca, accessory carpal; CI, first carpal; C2, second carpal; McII, McIIT, metacarpal bones; 1, tuber- osity of radius for attachment
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