. Medical and surgical therapy. External cutaneous. Small «fiiatio. ?External popliteal. Internal popliteal. Fio. 70.—Peripheral sensory distribution of the lower extremity(posterior aspect). The peroneus hrevis abducts and everts the foot. Finally, the extensor hrevis digitorum assists the extensor longus,and extends the first phalanges of the first four toes. Muscles supplied by the Internal Popliteal Nerve.—The popUtetismuscle flexes the leg on the thigh. The plantaris is very inconstant, and has no special action. The gastrocnemius and the soleus unite to form a single muscle,the triceps o
. Medical and surgical therapy. External cutaneous. Small «fiiatio. ?External popliteal. Internal popliteal. Fio. 70.—Peripheral sensory distribution of the lower extremity(posterior aspect). The peroneus hrevis abducts and everts the foot. Finally, the extensor hrevis digitorum assists the extensor longus,and extends the first phalanges of the first four toes. Muscles supplied by the Internal Popliteal Nerve.—The popUtetismuscle flexes the leg on the thigh. The plantaris is very inconstant, and has no special action. The gastrocnemius and the soleus unite to form a single muscle,the triceps of the leg, which ends in the powerful tendo Achillis. It 162 CLINICAL FORMS OF NERVE LESIONS lowers the foot and enables it to prolong the leg, or rather to flex thesole of the foot in adduction, for it acte forcibly on the heel and onthe outer half of the foot. The peroneus longus being a flexor and abductor neutralises the ,*\ r-Ilio-inguinal. External cutaneon>\. - Anterior cmral. Small sciatic.^ • Externa! popliteal. External saphenousbranch of internal popliteal. Fig, 71.—Peripheral sensory distribution of the lower limb(external aspect). effect of the action of the triceps. Both contribute to direct plantarflexion of the foot. Muscles supplied by the Posterior Tibial Nerve.—The tibialisposticus turns the foot directly inwards, being purely an it contracts, its tendon can be seen standing out just behind theinternal malleolus. GREAT SCIATIC AND POPLITEAL NERVES 163 The flexor longus digitorum flexes the last two phalanges of thefour outer toes. The flexor longus Jiallucis flexes the second phalanx of the big toe. Muscles supplied by the Plantar Nerves.—We shall divide the - Hio-inguinal. Anterior crural. Internal saphenous External popliteal(muscuio-cutaneous).
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