clonus

(klō′nŭs )

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[L. clonus, fr. Gr. klonos, turmoil, confusion]
Spasmodic alternation of muscular contractions between antagonistic muscle groups caused by a hyperactive stretch reflex from an upper motor neuron lesion. Sustained pressure or stretch of one of the muscles usually inhibits the reflex.
clonicity (klō-nis′ĭt-ē, klon- )

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, n.

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