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Show 1882.] ANATOMY OF ERETHIZON DORSATUS. 285 The pectineus extends from the brim of the pelvis dorsad of the origin of the third part of the adductor; it is inserted into the femur just below the lesser trochanter. The vastus externus is very large, its origin extending right up to the summit of the great trochanter. The vastus internus also extends very high up, namely up to the neck of the femur, dipping in within the insertion of the psoas. The crureus extends up to the neck of the femur, and is very imperfectly separated from the vastus internus. The rectus femoris has the usual origin and insertion. The tibialis anticus is very large, but does not take origin from the femur; it arises from the head of the fibula and the upper third of the tibia. Below its ends are two tendons, one of which is inserted into side of the proximal end of the metatarsal of the hallux, while the other goes to the plantar surface of the ectocunei-forme. The extensor longus digitorum arises by a tendon from the femur external to its rotular surface. It is a slender muscle, and sends tendons to the four outer digits. The extensor longus hallucis is very slender and small, arising only from the distal third of the fibula. The extensor brevis digitorum arises as usual, and sends tendons to the four outer digits. The peroneus longus is the most external of the peronei muscles, and arises from the head of the fibula. Passing behind the external malleolus, it proceeds to the metatarsal of the hallux as usual. The peroneus brevis arises from the antero-external aspect of the fibula. It is muscular down to the level of the malleolus, and ends in a very strong tendon (the largest of the peronei tendons), which is inserted into the proximal end of the fifth metatarsal. The peroneus quinti digiti is very slender, both as to its muscular belly and its tendon. It arises from the outside of the fibula, beneath the peroneus longus and behind the peroneus brevis, and in contact with the flexor longus hallucis. It becomes tendinous above the external malleolus ; and its slender tendon is inserted into the proximal part of the proximal phalanx of the fifth digit. The gastrocnemius has but the two normal heads, and is inserted into the calcaneal tuberosity. The soleus is very large and fleshy; it arises from the outer side of the upper two thirds of the fibula, and joins the tendo Achillis. The plantaris takes origin from the pit on the outer side of the external condyle of the femur, beneath the external lateral ligament. It ends as in the Agouti1. The popliteus is as in the Agouti. The flexor longus digitorum is a large muscle arising from the tibia beneath the popliteus; its tendon passes in a groove behind the internal malleolus, superficially to that of the tibialis posticus. It 1 P. Z. S. 1866, p. 414. |