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Show 1870] MYOLOGY OF PLATYDACTYLUS JAPONICUS. 425 the base of the first phalanx of the hallux, and of the second and third digits; the fourth is inserted by two heads, one of which goes to the head of the metatarsal bone, aud the other to the side of the first phalanx of the fourth digit. Interosseiplantares.-Four in number; three fill up the spaces between the metatarsals of the first three digits, the fibres going obliquely from the fibular to the tibial side; the other arises from the cuboid and goes to the metatarsal bone of the fourth digit without entirely filling up the space. Tibialis anticus is visible both on the flexor and extensor sides of the leg; it arises from the surface of the tibia for nearly its whole length, and is inserted into the metatarsal bone of the hallux. Peroneus longus arises from distal half of the fibula on the flexor side, and is inserted fleshy into the cuboid close to its articulation with the fifth digit; from this it gives off a broad tendinous expansion, which is inserted into the cuneiform bone, covering the tarsus beneath the flexor tendons; from its extreme point on the tibial side arises a small muscle, which is inserted into the head of the metatarsal bone of the hallux. Peroneus brevis arises from the distal two-thirds of the outer surface of the fibula, and is inserted into the cuboid bone of the tarsus; it also sends a tendon to the back of the foot, which is inserted into the extremity of the metatarsal bone of the fourth digit. Extensor longus digitorum arises from the anterior aspect of the peroneal condyle of the femur by a flat tendon; it forms a thick belly in the leg, partially divisible into two, and ends by two flat tendons, which are inserted into the metatarsal bones of the second and third digits. If this muscle were situated in the forearm it might be called ext. carp. rad. long, et brev. Extensor ossis metatarsi hallucis arises from the distal end of fibula, and crossing the tarsus is inserted into the whole length of the tibial side of the metatarsal bone of the hallux. Extensor brevis digitorum arises from the peroneal side of the bone of the tarsus corresponding with the united astragalus and calcaneum. It consists of four radiating fasciculi: the first crosses the foot and ends in a tendon, which is inserted into the penultimate phalanx of the hallux; the second is inserted in like manner into the penultimate phalanx of the third digit, the third into the third phalanx of the fourth digit; the fourth fasciculus is intimately united to the dorsal interosseus of the fifth digit, its tendon being inserted into the second phalanx of that digit. Interossei dorsales.-Two muscles arise together from the dorsal surface of the metatarsal bone of the hallux : one goes to the tibial side of the hallux, being inserted into the whole length of its metatarsal bone and phalanges; the other goes to the tibial side of the second digit. The interosseus of the fibular side of the hallux arises from the tibial side of the metatarsal bone of the second digit. T wo muscles arise together from the dorsal side of the second metatarsal bone : one forms an extensor for that digit, and is inserted by a long tendon into its penultimate phalanx; the other forms an interosseus |