. Bensley's Practical anatomy of the rabbit : an elementary laboratory text-book in mammalian anatomy. Rabbits -- Anatomy. 214 ANATOMY OF THE RABBIT articulation with the tibia, and forming with the latter the chief portion of the ankle-joint. Its distal end, termed the head of the talus (caput tali), provides a convex articular surface for the navicular bone, and is separated from the larger trochlear portion by a slightly constricted intermediate portion or neck (collum tali). Its ventrolateral border is extensively articulated with the calcaneus. The latter represents the ulnar tarsal, or u
. Bensley's Practical anatomy of the rabbit : an elementary laboratory text-book in mammalian anatomy. Rabbits -- Anatomy. 214 ANATOMY OF THE RABBIT articulation with the tibia, and forming with the latter the chief portion of the ankle-joint. Its distal end, termed the head of the talus (caput tali), provides a convex articular surface for the navicular bone, and is separated from the larger trochlear portion by a slightly constricted intermediate portion or neck (collum tali). Its ventrolateral border is extensively articulated with the calcaneus. The latter represents the ulnar tarsal, or ulnare, of the primary limb skeleton and is a cylindrical element, fully twice as long as the talus, since it is extended backward behind the ankle-joint as the tuber calcanei, or bone of the heel. Its dorsal surface bears a prominent elevation for articulation with the fibular side of the tibiofibula. Its medial surface bears a flat, shelf-like process, the sustentaculum tali, which forms a ventral support for the talus. The distal extremity of the bone articu- lates wdth the cuboid and also with the navicular. The intermediate element, the na- vicular bone comes between proximal and distal tarsals and is the central bone of the primary pattern. Thus it does not correspond with the navicular bone of the wrist, which is the radiale (p. 205). It is a somewhat cubical bone, lying on the medial side of the tarsus between the talus, on the one hand, and the proximal end of the second metatarsal bone and the second and third cuneiform bones, on the other. It represents the central bone of the primitive tarsus (Fig. 36) and its position is more nearly that of a central element than is the case with the bone called by this name in the rabbit's carpus. In this connection it will be remembered that the carpus. Fig. 98. The bones of the left foot, viewed from the dorsal sur- face: T, tarsus; M, metatarsus; P, phalanges. II-V, the four metatarsal bones. cb., cuboid; cl., calcaneus; , s
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