Elementary exercises in physiology . h of the flexor surface ofthe tibia; it ends in a tendon which passes around the inner malleolus, lying ina groove in the lower end of the tilbia and is inserted into the dorsal surface ofthe astragalus. The Tibialis Anticus lies on the extensor surface of the leg; it arises bya long thin tendon from the lower end of the femur and divides about tlie middleof the leg into two bellies which are inserted into the proximal ends of theastragalus and calcaneum respectively. The Extensor Cruris lies along and is partly covered by the tibialis anticus.It arises by
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Elementary exercises in physiology . h of the flexor surface ofthe tibia; it ends in a tendon which passes around the inner malleolus, lying ina groove in the lower end of the tilbia and is inserted into the dorsal surface ofthe astragalus. The Tibialis Anticus lies on the extensor surface of the leg; it arises bya long thin tendon from the lower end of the femur and divides about tlie middleof the leg into two bellies which are inserted into the proximal ends of theastragalus and calcaneum respectively. The Extensor Cruris lies along and is partly covered by the tibialis anticus.It arises by a long tendon from the condyle of the femur and runs in a grooveir. the upper end of the tibia and is inserted into the extensor surface of thetibia along nearly its whole length. The Peroneus is a stout musele which lies between the tibialis anticus andthe gastrocnemius. It arises from the distal end of the femur and is insertedinto the outor malleolus of the tibia and the proximal end of the caloaneum. 247. Dissection op the /imw^. Aferi^e muscle preaaratjon, Fie. 7 Sciatic Nebvb. Expose themuscles of the dorsal aspectof the thigh, carefully sepa-rate the hiceps and semimem-iranosus; closely applied tothe deeper margin of thebiceps will be found thesciatic nerve aeeompanied bya blood vessel. Carefullyfollow the nerve toward theb, ody noting its passage be-tween the pyriformis and thehead of the iiceps. Follow 76 tile nerve up to its connection with the lum^bar region of the spinalcord. Return to the middle of the thigh and note that the nerve sendsoff a branch which passes along the extensor side of the tibia alongthe peroneus and beyond. Follow the sciatic and note that at theknee joint it again divides, one branch going to the gastrocnemiusand the other to the tibialis posticus muscle. The sciatic nerve, gastrocnemius muscle and a portion of the femur comprise a nerve-muscle preparation. XVIIHEART BEAT OF FROG 248. Place a frog on its belly and note the movements of thecaudal