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Show 320 DR. GADOW ON THE ANATOMY OF PTEROCLES. [Mar. 2i, passes between the two principal branches of the ischiadic nerve, and is supported by the descending tendon of the m. semitendinosus = m. cauda? ilio-flexorius. ft. This head is the larger of the two, and is the most superficial one at the hinder and external aspect of the leg, as it arises from the external condyle of the femur. The "tendo communis" of these four heads is inserted into the hinder margin of the tarso-metatarsal bone, but principally into the tibial and median margin. The m. extensor digitorum communis appears after the removal of the superficial peroneal and of the tibialis muscle, being completely covered by the latter. It arises from the anterior plane of the head and neck of the tibia ; its tendon passes through the transverse ligament and the bony bridge just above the intertarsal joint ; it then runs down on the anterior surface of the metatarsal bone, and sends a tendon to the dorsal part of the bases of the phalanges of the three front toes. The mode of splitting up of the common tendon into the special tendons and of their insertion varies much. M. perforatus digiti n.-This muscle appears after the removal of the most superficial of the flexor muscles on the outer side of the leg. It comes with fleshy fibres from the ligam. fern, tibiale externum and from the hinder part of the neck of the tibia. Its long and slender tendon, after crossing the legs, passes right through the susceptaculum in the middle of the hinder aspect of the intertarsal joint, where it lies deeper than all the other tendons. It is inserted into the ventral side of the phalanges n. et in. digiti n. M. perforatus digiti in. consists of two very fleshy heads. The outer one is completely fused with that of the m. perforatus dig. n.; it arises partly from the external condyle of the femur and from the tendinous loop ; one part of this head forms the continuation of the tendon of the ambiens muscle. The inner head arises with a distinct tendon from the hinder aspect of the middle part of the intercondyloid region. The combined tendon of the whole muscle, when passing over the intertarsal joint, is quite flat, and lies between the susceptaculum and the broad tendon of the gastrocnemius muscle. Thus in this region it is the most superficial of all the flexor tendons. At the middle of the metatarsal bone the tendon gives off a slip to that of the m. perforans et perforatus dig. in. M.flex. perforatus dig. iv.-Its thick belly arises from the hinder aspect of the external condyle of the femur and from the intercondyloid region. Its tendon, simply covered by the tendo Achillis, passes as the most superficial one over the joint and is inserted into the basis phal. n. dig. iv. The m. flex, perforans et perforatus dig. in. arises with a long slender head together with the m. perforatus dig. in. and with the m. perforatus dig. n. ; its tendon sends a slip to that of the m. perforatus, which it also perforates, and is inserted into the bas. phal. n. et in. dig. in.; on the other hand, this tendon is pierced by that of the m. flexor profundus. |
