. The comparative anatomy of the domesticated animals. Veterinary anatomy. 2M THE ARTICULATIONS. of the inter-, lateral, and inferior sesamoid middle and deep ligaments. An injection of the eynovinl capsule brings into relief some features which are interesting, from a surgical point of view. This is a perfect hinge-joint, formed by the inferior extremity of the median metacarpal bone on the one part, and the superior extremity of the upper phalanx and sesamoids on the other. Articular surfaces.—For the metacarpal bone, there are two lateral condyles and a median antero-posterior eminence ; fo
. The comparative anatomy of the domesticated animals. Veterinary anatomy. 2M THE ARTICULATIONS. of the inter-, lateral, and inferior sesamoid middle and deep ligaments. An injection of the eynovinl capsule brings into relief some features which are interesting, from a surgical point of view. This is a perfect hinge-joint, formed by the inferior extremity of the median metacarpal bone on the one part, and the superior extremity of the upper phalanx and sesamoids on the other. Articular surfaces.—For the metacarpal bone, there are two lateral condyles and a median antero-posterior eminence ; for the first phalanx, two glenoid cavities and an intermediate groove prolonged posteriorly on the anterior face of the two sesamoids. Divided in this manner into three portions, the digital surface is well constituted for solidity, because the pressure transmitted to this region is diminished and. Fig. 131. diffused by the natural -*- ^ elasticity of the bands which unite these three pieces to each other. 3Iode of union.—The means of union may be divided into two cate- gories : 1. Those which join together the several bones of the inferior sur- face. 2. Those which maintain in contact the two opposed articular surfaces. A. The firet have re- ceived the generic name of sesamoid ligaments, and are six in number : an intersesamoid ligamenty which holds together the two complementary bones of the digital surface; three inferior and two lateral sesamoid ligaments, which unite these bones to the first phalanx. a. The intersesamoid ligament is composed of fibro-cartilaginous substance, that appears to be the matrix in which the two sesamoids were developed ; as it is spread around these bones, after being solidly fixed on their internal face. Behind, this ligament, in common with the posterior face of the sesamoids, forms the channel (Fig. 131, 5) in which the flexor tendons glide. In front, it occupies the bottom of the intersesamoid articular groove. h. The inferior sesamoid lig
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