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Show 880 MH. ST. GEORGE MIVART ON THE [Dec. 6, The vastus internus (fig. 19, V. 1) is a rather small muscle arising from the inside of the shaft of the femur, almost down to the distal end of the bone. It blends below with the other extensors. Fig. 23. Back view of right leg. B. Biceps. B. H. Flexor brevis hallucis. B. M. Flexor brevis minimi digiti. F.J)1. Flexor longus digitorum. F.D2. Flexor tertius digitorum. G. Gracilis. G.E. Gastrocnemius externus. G.I. Gastrocnemius internus. LP. Ilio-peroneal.' P. Peroneus. 8. Tibial adductor. S. M. Semimembranosus. 8. T. Semitendinosus. T. A. Tibialis anticus. T. P. Tibialis posticus, y. Tendon of femoro-caudal. Crureus (fig. 21, C). This is very large, but with difficulty separable from the two preceding muscles. It arises from the extensor surface of the femur, its origin extending upward to the neck of the bone on its inner aspect (passing up on the inner side of the insertion of the iliacus) ; fusing with the other extensors, it is inserted with them into the patella. The gastrocnemius externus (figs. 17, 18, 19, 23, & 24, G. E) arises by a long and strong, but delicate tendon from the postero-peroneal aspect of the interarticular cartilage. This tendon passes down between the flexor longus and flexor tertius digitorum. Rapidly broadening downward (as a fleshy mass having the gastrocnemius internus superficial to it), it is inserted into the plantar ossicle. The gastrocnemius internus (figs. 18, 19, 20, 23, & 24, G. I) does |