. The anatomy of the domestic animals . Veterinary anatomy. 102 THE SKELETON OF THE HORSE Proximal sesamoids First plialaiix remarked that the bone is twisted slightly; when placed volar surface down on the table, it touches the latter by three points only, the proximal tuberosities and the medial condyle. The Second Phalanx The second phalanx (Phalanx secunda)' is situated between the first and third phalanges, its direction corresponding to that of the first phalanx. It is flattened from before backward, and its width is greater than its height. It may be described as possessing four surface
. The anatomy of the domestic animals . Veterinary anatomy. 102 THE SKELETON OF THE HORSE Proximal sesamoids First plialaiix remarked that the bone is twisted slightly; when placed volar surface down on the table, it touches the latter by three points only, the proximal tuberosities and the medial condyle. The Second Phalanx The second phalanx (Phalanx secunda)' is situated between the first and third phalanges, its direction corresponding to that of the first phalanx. It is flattened from before backward, and its width is greater than its height. It may be described as possessing four surfaces. The proximal surface presents two glenoid cavities separated by a low ridge, and articulates with the first phalanx. The middle of the dorsal border is ele- vated and roughened in front for the attachment of the common extensor tendon. The volar border is thick and overhanging; in the fresh state its mid- dle part is covered with cartilage, over which the deep flexor tendon passes. On either side there is an eminence, to which the collateral ligament and the superficial flexor tendon are attached. The distal surface is trochlear, and articulates with the third phalanx and distal sesamoid bone. It resem- bles somewhat the trochlea of the first phalanx, but is more extensive and en- croaches more on the dorsal and volar surfaces. The dorsal surface is convex from side to side and smooth in its middle; on each side of its distal part is a rough depression, surmounted by a tuber- osity, to both of which ligaments are attached. The volar surface is smooth and flattened. The borders which separate the dorsal and volar surfaces are con- cave from above downward, rounded from before backward. Development.—The second pha- lanx ossifles like the first, but the proxi- mal end unites with the shaft two or three months earlier. The Third Phalanx The third phalanx (Phalanx ter- tia)^ is entirely inclosed by the hoof, It presents for examination three sur- Tuberosity .--#1 Ridges for att
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