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Clonus (from the Greek for "violent, confused motion") is a series of involuntary muscular contractions due to sudden stretching of the muscle. Clonus is a sign of certain neurological conditions, and is particularly associated with so-called upper motor neuron lesions such as stroke, multiple sclerosis or spinal cord damage. Unlike the small, spontaneous twitching known as fasciculations (usually caused by lower motor neuron pathology), clonus causes large motions that are usually initiated by a reflex.
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