The practice of pediatrics . n of themuscles relieves the discomfort or even pain due to spasm. Death oc-curs after years of invalidism from some intercurrent affection. HEREDITARY SPASTIC PARALYSIS. Hereditary Spastic Paralysis, or Family Spastic Paralysis, is a condi-tion of spastic paralysis affecting the lower extremities, at times to aslight degree the upper extremities, and occurring as a family diseasewith heredity as an important factor. It may be due to different causes. ABIOTROPHIC DISEASES 917 Practically all of these cases, however, depend on an abiotrophy anda defective developmen
The practice of pediatrics . n of themuscles relieves the discomfort or even pain due to spasm. Death oc-curs after years of invalidism from some intercurrent affection. HEREDITARY SPASTIC PARALYSIS. Hereditary Spastic Paralysis, or Family Spastic Paralysis, is a condi-tion of spastic paralysis affecting the lower extremities, at times to aslight degree the upper extremities, and occurring as a family diseasewith heredity as an important factor. It may be due to different causes. ABIOTROPHIC DISEASES 917 Practically all of these cases, however, depend on an abiotrophy anda defective development of either the brain or of the spinal cord (, 184). We may therefore classify them into two distinct types:(a) Those due to a defective development of the motor tracts (crosspyramidal tracts of the spinal cord). (6) Those due to an arrestedcerebral development. (a) In the first group of cases there is no evidence of cerebral is simply an affection of the spinal motor tracts. These may Fig. 183 Fig. 184.
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