. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. 38 Anatomy of the Woodenuck, Marmota monax. Fig. 2-43. Hind paw, plantar view. I-V = metatarsals, 1- 5 = digits. 1 talus, 2 proximal tarsal sesamoid, 3 central tarsal (navicular), 4 distal tarsal sesamoid, 5 second tarsal bone (intermediate cuneiform), 6 first tarsal bone (medial cuneiform), 7 flexor tubercle, 8 distal sesamoid, 9 middle phalanx of fifth digit, 10 proximal phalanx of fifth digit, 11 proximal sesamoid, 12 fifth metatarsal, 13 fourth tarsal cu- boideum), 14 third tarsal bone (lateral cuneiform), 15 cal- caneus, 16 c
. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. 38 Anatomy of the Woodenuck, Marmota monax. Fig. 2-43. Hind paw, plantar view. I-V = metatarsals, 1- 5 = digits. 1 talus, 2 proximal tarsal sesamoid, 3 central tarsal (navicular), 4 distal tarsal sesamoid, 5 second tarsal bone (intermediate cuneiform), 6 first tarsal bone (medial cuneiform), 7 flexor tubercle, 8 distal sesamoid, 9 middle phalanx of fifth digit, 10 proximal phalanx of fifth digit, 11 proximal sesamoid, 12 fifth metatarsal, 13 fourth tarsal cu- boideum), 14 third tarsal bone (lateral cuneiform), 15 cal- caneus, 16 calcaneal tuber. The metatarsal and digital bones, ossa metatar- salia 1-V and ossa digitorum pedis (Fig. ), are similar to those of the thoracic limb, except that the first metatarsal and first digit of the hind foot are well developed. All the metacarpal and meta- tarsal bones have distal epiphyseal growth lines, ex- cept for the first metatarsal, in which the growth line is proximal. Sesamoid Bones of the Pelvic Limb. There are four sesamoid bones in the pelvic limb. Two of these, the lateral and medial fabellae, ossa sesamo- idea m. gastrocnemii (Fig. 2-39), are located caudal to the knee in the tendons of origin of the gastroc- nemius muscle. They are cuboidal and articulate with the condyles of the femur. The third sesamoid, os sesamoideum m. poplitei, is located in the tendon of origin of the popliteal muscle. It is small, oval in shape, and articulates with the lateral condyle of the tibia. The fourth ses- amoid bone lies in the cranial part of the medial meniscus of the knee. It is wedge-shaped and artic- ulates with the medial condyles of the femur and the tibia. It is larger than the other sesamoid bones of the knee. There are two sesamoid bones on the medial as- pect of the tarsus (Figs. 2-42 and 2-43). The prox- imal tarsal sesamoid bone lies on the medial aspect of the talus. It is about 5 mm in diameter and ar- ticulates medially with the talus and distally wi
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