. Medical and surgical therapy. s sensorN* branches are the first seven collateral plantar branches. The external plantar nerve, the smaller of the two (the homologueof the ulnar nerve in the hand), supplies all the interossei, the musclesof the little toe, the third and fourth lumbricales, the abductor obliquusand transversus; it also supplies the last three collateral plantarbranches. As in the case of the ulnar in the hand, it has a cutaneousbranch, which is purely sensory, and a deep mtLscular branch. PHYSIOLOGY The Muscles supplied by the Great Sciatic—The biceps, semi-tendinosus, and sem
. Medical and surgical therapy. s sensorN* branches are the first seven collateral plantar branches. The external plantar nerve, the smaller of the two (the homologueof the ulnar nerve in the hand), supplies all the interossei, the musclesof the little toe, the third and fourth lumbricales, the abductor obliquusand transversus; it also supplies the last three collateral plantarbranches. As in the case of the ulnar in the hand, it has a cutaneousbranch, which is purely sensory, and a deep mtLscular branch. PHYSIOLOGY The Muscles supplied by the Great Sciatic—The biceps, semi-tendinosus, and semimembranosus are all flexors of the leg on thethigh. According to Duchenne (of Boulogne), these muscles also extendthe thigh on the ]>elvis in walking, and rotate the leg on the thigh,the semitendinosus rotating it inwards and the biceps outwards. GREAT SCIATIC AND POPLITEAL NERVES 159 Muscles supplied by the External Popliteal.—The tibialis anticuscauses very powerful flexion of the dorsum of the foot. Its thick JdJ D i. tendon stands out prominently on the anterior aspect of the anklewhen the foot is lifted and carried inwards, so that this muscle alsoadducts and rotates the foot. The extensor longus digitorum extends the first phalanges of the 160 CLINICAL FORMS OF NERVE LESIONS four outer toes. It assists in dorsal flexion of the foot, which it alsoi;bducts slightly. External cutaneous. K: . - lUo-inguinal. - Obturator. Ajiterlor crural(musculo-cutaneovLSj. External popliteal. ^. , - Internal saphenous. , Ajiterior tibial. Externa] saphenous. ^ - FiQ. 69.—Peripheral sensory distribution of the lower extremity(anterior aspect). The extensor proprius hallucis forcibly extends the first phalanxof the great toe, and the second very slightly. The peroneus tertius is an inconstant muscle, and is only a part ofthe extensor longus. The peroneus longus has the following action :— 1. It produces plantar flexion of the foot, but not so effectivelyas the gastrocnemius and so
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Keywords: ., bookcentury1900, bookdecade1910, bookpub, booksubjecttherapeutics
