. The comparative anatomy of the domesticated animals. Veterinary anatomy. 8i TUB bones: Sesamoids.âThese are two small short bones placed side by side behind the superior extremity of the first phalanx, whose articular surface it completes, as it has not extent enough to be exactly adapted to the metacarpal surface. Each of these bones represents a small, irregularly- shaped polyhedron, or rather, a short trifacial pyramid. It offers: an anterior face, which is articular, and corresponding to the inferior extremity of the principal metacarpal bone, moulded, as it were, on one of the condyles
. The comparative anatomy of the domesticated animals. Veterinary anatomy. 8i TUB bones: Sesamoids.âThese are two small short bones placed side by side behind the superior extremity of the first phalanx, whose articular surface it completes, as it has not extent enough to be exactly adapted to the metacarpal surface. Each of these bones represents a small, irregularly- shaped polyhedron, or rather, a short trifacial pyramid. It offers: an anterior face, which is articular, and corresponding to the inferior extremity of the principal metacarpal bone, moulded, as it were, on one of the condyles and one of the sides of the median ridge; a posterior face, covered with cartilage in the fresh state, and forming, with that of the opposite bone, a gliding concave surface for the flexor tendons of the phalanges ; a lateral face, studded with ligamentous imprints; a summit, directed upwards; and a base, turned downwards, and serving for the attachment of several ligaments. Second (ob Middle) Phalanx (Os CoEONiE, Small Pastern Bone).â This is a short bone, situated in the same obliqiie direction as the first phalanx, and between it and the third. Its general form is that of a cube flattened before and behind, and offering the following features : an anterior face, covered with some slight imprints; a posterior face, provided, above, with a transversely elongated gliding surface ; a superior face, channeled by two glenoid cavities, to match the inferior articulating surface of the first phalanx; an inferior face, formed on the same plan as the last, being occupied by two unequal condyles which articulate with the third phalanx and the navicular bone ; tioo lateral faces exhibiting a very marked imprint. In the interior of this bone is found a nucleus of very condensed spongy substance, enveloped in a layer of compact tissue. It is usually developed from a single centre of ossification; though in many subjects there is a complementary nucleus for the superior articular surface
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