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Show 646 MR. W. F. R. WELDON ON THE [Dec. 18, 16. The flexor perforatus et perforans arises by two heads-one from the outer condyle of the femur, just distal to the outer head of the gastrocnemius, and one from the fascia over the peroneus longus: the two heads are connected by a tendinous intersection. The two heads give rise to two separate tendons, which pass the ankle-joint on the inner side of the leg, just below the tendo Achillis. They supply the second and third digits. 17. The flexor perforatus arises from the femur by a flat tendon from the inner condyle, and by a fleshy head from the outer : these heads unite to form a fleshy belly, which receives two slips from the flexor perforatus et perforans. After receiving these slips the muscle splits into three tendons, which at the annular ligament are internal to the tendons of the flexor last described, and superficial to those of the flexor profundus. 18. The flexor profundus arises from the whole length of the fibula and the adjacent parts of the tibia. Above, the tibial and fibular portions are more or less distinctly separable; and further down the belly the separation is continued by a tendinous raphe. There is a single tendon, which passes through the annular ligament below all the others. 19. The flexor longus poliicis has the typical arrangement called "ciconine" by Garrod. - 20. The peroneus longus arises from the crest of the tibia and from the fascia covering the tibialis anticus; also from the fascia between itself and the head of the gastrocnemius. All these origins are fleshy. A broad, flat tendon passes to the outside of the leg, at the ankle, through a special groove in the outer malleolus of the tibio-tarsus, joining the tendon of the flexor perforatus about a third of the way down the tarso-metatarse. Just before passing the ankle-joint the tendon gives off a broad flat ligament to the tibia. There is no peroneus brevis. 21. The tibialis anticus arises from the outer condyle of the femur, from the upper and outer side of the cnemial crest of the tibia, and from the aponeurosis covering the extensor communis digitorum. The tendon passes superficially through the anterior annular ligament, and is inserted into a pit in the tarso-metatarsus about an inch below the joint. 22. The extensor communis digitorum has a fleshy triangular origin from the inner border of the anterior face of the tibia for about five inches: its tendon is first beneath, then internal to that of the tibialis anticus, and supplies the second, third, and fourth digits, but not the thumb. 23. The plantaris arises from the inner side of the posterior surface of the tibia for about an inch ; its belly is very small ; and its long slender tendon is inserted into the deep surface of the annular ligament. 24. There are two poplitei. The short muscles of the foot are an abductor, an abductor indicis, a small flexor of the middle finger, and an abductor minimi digiti, on the dorsal side : on the ventral side are a short flexor of the hallux, and a short flexor of the second toe. |
