. A manual of diseases of the nervous system. y sensorystimulus will make the legs shoot out in spasm (Fig. 131). But therigidity does not reach the extreme degree often attained in the commonform. The excess of the knee-jerk is always distinct, but a foot-clonus is not often to be obtained, perhaps because the muscle-reflexmechanism related to the calf muscles has not received the functionaldevelopment that must result from the process of walking, with itsrecurring sequence of tension and contraction. The active contracturein the calf muscles, which most cases present, is a serious hindrancet
. A manual of diseases of the nervous system. y sensorystimulus will make the legs shoot out in spasm (Fig. 131). But therigidity does not reach the extreme degree often attained in the commonform. The excess of the knee-jerk is always distinct, but a foot-clonus is not often to be obtained, perhaps because the muscle-reflexmechanism related to the calf muscles has not received the functionaldevelopment that must result from the process of walking, with itsrecurring sequence of tension and contraction. The active contracturein the calf muscles, which most cases present, is a serious hindranceto walking even when the muscular power is sufficient, and it is long 496 SPINAL COED. before the attempt overcomes the contracture. In most cases, how-ever, the child ultimately gains the power of walking, although muchlater than normal, and often with some peculiarity of gait, sometimesa tendency to cross-legged progression, in which one foot gets overor in front of the other (Fig. 132), or with a swinging oscillation of Fig. 132. Wia.
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