A manual of diseases of the nervous system . ES OF LOWER LIMB. 41 In paralysis of the flexors, the resulting loss of the power of flexion interfereswith walking, since tiie knee-joint cannot be bent, in the forward movement ofthe leg, until the thigh is flexed sufficiently to permit the weight of the foot toflex the knee. To prevent the toes striking the ground the foot is unduly flexedon the leg. The loss of the support that the flexor tendons give to the knee-joint leads to an undue strain on the ligaments, which become stretched, andslight retroflexion of the joint may occur. In paralysis o
A manual of diseases of the nervous system . ES OF LOWER LIMB. 41 In paralysis of the flexors, the resulting loss of the power of flexion interfereswith walking, since tiie knee-joint cannot be bent, in the forward movement ofthe leg, until the thigh is flexed sufficiently to permit the weight of the foot toflex the knee. To prevent the toes striking the ground the foot is unduly flexedon the leg. The loss of the support that the flexor tendons give to the knee-joint leads to an undue strain on the ligaments, which become stretched, andslight retroflexion of the joint may occur. In paralysis of the muscles that extend the hip, there is a tendency to fallforwards in walking. To counteract this the trunk is carried backwards, and afatiguing strain on the flexors of the hip results. In paralysis of the biceps, the leg, during flexion, is rotated inwards ; when thebiceps remains and the other muscles are paralysed, there is an undue rotation out- Tibialis anticnsExtensor digit, Peroneus brevis. Extensor long. poll. Dorsal interossei. — T!xt. popUt. n. Gastroctem. (outer head).Peroneus lougus. Soleus. Flexor long. poUicis. Extensor brev. miuim. digit. Fig. 26.—Motor points of leg, outer side (Erb). wards. The effect of these abnormal movements on the ligaments of the joint issuch that, after a time, the amount of rotation becomes greater than is possible inhealth. The Popliteus (internal popliteal nerve) has but a feeble power of flexing theknee. Its chief action is to rotate the leg inwards when the knee-joint has beenflexed. Muscles MOVING THE Foot.—Extensors o,Foot on Leg.*—The Gastrocnewius * These muscles are sometimes termed plantar flexors, because thev are liomo-logous with the flexors of the wrist. The term is a bad one, since it involves a use 42 ACTION AND PARALYSIS OF MUSCLES. and Soleus (internal popliteal nerve, from the sciatic) have the same extend the hinder part of the foot and draw down the outer side of theforepart o
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