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Show 886 MR. ST. GEORGE MIVART ON THE [Dec. 6, flexor brevis hallucis superficial to it), goes to the three peroneal digits with three delicate tendons. It forms a fleshy mass, which is superficial to the long flexor tendons. Flexor brevis hallucis (fig. 23, B. H ) . A short thick muscular mass arises from the plantar ossicle, and from the ligament which connects together the tibial and peroneal margins of the tarsus on its plantar aspect. It is inserted into the tibial aspect of the hallux, distad and tibiad to the insertion of the tibialis anticus. Flexor brevis minimi digiti (fig. 23, B. M ) . This arises from the peroneal aspect of the plantar ossicle, and is inserted into the same side of the fifth digit down to (including) the penultimate joint of that digit. Adductor digiti secundi. A muscle springs from the ligament which connects the second and third metatarsals, and is inserted into the peroneal side of the second digit. Adductor digiti tertii. Another muscle similarly springs from the same ligament, and is inserted into the tibial side of the third digit. The extensores metatarsorum are very numerous ; but all are short muscles, except the one which goes to the hallux. Extensores I. and II. (fig. 18, 19, 25, & 26, E. 1 & 2). The extensor of the second digit is double, like that of the pollex. The larger and longer part arises from the front of the fibula (covered by the peroneus and extensor longus digitorum) for nearly* its lower two-thirds. Passing downward, it is inserted by tendon into the distal part of the dorsum of the second metatarsal. The second part, m u c h smaller, takes origin below the first part, and, joining it, is inserted together with it. Extensor III. A very small muscle springs from the fascia in front of the central tarsal ossicle, and is inserted into the dorsum of the first metatarsal. Extensor IV. A similarly small muscle, similarly arising, but inserted into the dorsum of the second metatarsal. Extensor V. Another small muscle arising similarly is inserted into the dorsum of the third metatarsal, passing out between the extensor longus digitorum and the extensores I. and II. Extensores VI. and VII. (fig. 25, E. 6 & 7). These two small muscles have again a similar origin, and are inserted into the distal parts of the upper surfaces of the fourth and fifth metatarsals. Extensor VIII. (fig. 25, E. 8). This is a somewhat larger muscle. It arises from the lower end of the peroneal border of the fibula. Passing downward, it is inserted into the distal end of the dorsum of the fifth metatarsal. The extensor IX. (figs. 25 & 26, E. 9) springs from the distal end of the fibula and from the peroneal tarsal bone. Passing downward, and radiating in a fan-like manner, it is inserted into the dorsum of the fifth metatarsal. Beside these extensores of the metatarsal bones, there are five extensores of the phalanges, extensores phalangorum (fig. 26, B. 3, B. 4, & B. 5). Of these each passes from the dorsum of one of the metatarsals to the ungual phalanx of the same digit. |