. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE POSTERIOR LIMBS. 145 between the inferior extremity of the tibia and the superior extremity of the metatarsal bones ; they are arranged, like the bones of the carpus, in two tiers— a superior and an inferior. The superior row only comprises two bones, the largest; these are the astragalus and the calcaneum (or calcis). The inferior row is formed, outwardly, of the cuboides alone ; inwardly and anteriorly, it is subdivided into two secondary rows, the superior of which is constituted by the scaphoides, and the inferi
. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE POSTERIOR LIMBS. 145 between the inferior extremity of the tibia and the superior extremity of the metatarsal bones ; they are arranged, like the bones of the carpus, in two tiers— a superior and an inferior. The superior row only comprises two bones, the largest; these are the astragalus and the calcaneum (or calcis). The inferior row is formed, outwardly, of the cuboides alone ; inwardly and anteriorly, it is subdivided into two secondary rows, the superior of which is constituted by the scaphoides, and the inferior by the large and small cuneiform bones. The last is sometimes divided into two, in which case there are three cunei- forms ; then the total number of the bones is Astragalus.—An irregular cubical bone, situ- ated in front of the calcis, between the tibia and the scaphoid, and divided into Jive faces : 1. A superior and anterior, formed as an articular pulley to correspond with the inferior extremity of the tibia. This pulley—oblique from above down- wards, forwards, and outwards—may be considered as the type of the most perfect trochlea in the body ; it forms with the median plane of the body an angle of from 12° to 15°. Its borders are slightly spiral, the inner being more prolonged backwards than the external; its groove receives the median tenon of the tibia, and its two ridges or lips fit into the lateral furrows of that bone ; the two lips are deeply implanted in the lateral grooves, and their two fossae are hollowed out of their lower extremity, to admit the end of the principal bone during flexion movements, 2. An inferior face, occupied by a slightly convex articu- lar surface articulating with the scaphoid ; this surface is notched outwardly by an excavation for ligamentous insertion ; behind the internal ex- tremity of this furrow, the articular face is cut in such a manner as to present two facets inclined towards each other, and separated by a sharp rid
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