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Table 53-1

Signs that Distinguish the Origin of Weakness

SignUpper Motor NeuronLower Motor NeuronMyopathicPsychogenic
AtrophyNoneSevereMildNone
FasciculationsNoneCommonNoneNone
ToneSpasticDecreasedNormal/decreasedVariable/paratonia
Distribution of weaknessPyramidal/regionalDistal/segmentalProximalVariable/inconsistent with daily activities
Muscle stretch reflexesHyperactiveHypoactive/absentNormal/hypoactiveNormal
Babinski signPresentAbsentAbsentAbsent