Nervous and mental diseases . Fig. 157.—A case of progressive muscular atrophy of the spinal type in the sixth year of thedisease. All skeletal muscles alfecied. The muscular atrophi and iceakness usually come on together andprogress equally. In the great majority of cases wastiug appears firstin the radial half of the hands, sometimes first in one hand, sometimesin both hands at ouce. In another group of cases the shoulder-musclesare first affected. In the hands the disease ordinarily affects firstthe thenar muscles. It, therefore, appears to elect those muscles whichshow the highest differen
Nervous and mental diseases . Fig. 157.—A case of progressive muscular atrophy of the spinal type in the sixth year of thedisease. All skeletal muscles alfecied. The muscular atrophi and iceakness usually come on together andprogress equally. In the great majority of cases wastiug appears firstin the radial half of the hands, sometimes first in one hand, sometimesin both hands at ouce. In another group of cases the shoulder-musclesare first affected. In the hands the disease ordinarily affects firstthe thenar muscles. It, therefore, appears to elect those muscles whichshow the highest differentiation of function and which represent thelatest motor acquirements in the evolutionary scale,—namely, circum-duction of the upper limb and the opposition of the thumb to thefingers. If the morbid process be one of involution, we might naturallyexpect such a program. It results in flattening the palm, and thethumb falls back into the same plane with the other digits, producing 412 DISEASES OF THE CORD PROPER. the ape han
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Keywords: ., bookcentury1900, booksubjectmentalillness, booksubjectnervoussys
