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Clonus (from the Greek for "violent, confused motion") is a series of involuntary, rhythmic, muscular contractions and relaxations. Clonus is a sign of certain neurological conditions, particularly associated with upper motor neuron lesions involving descending motor pathways, and in many cases is, accompanied by spasticity (another form of hyperexcitability).〔 Unlike small, spontaneous twitches known as fasciculations (usually caused by lower motor neuron pathology), clonus causes large motions that are usually initiated by a reflex. Studies have shown clonus beat frequency to range from 3–8 Hz on average, and may last a few seconds to several minutes depending on the patient’s condition.〔 ==Signs and symptoms== Clonus is most commonly found at the ankle, specifically with a dorsiflexion/plantarflexion movement (up and down).〔 Some case studies have also reported clonus in the finger, toe, and laterally in the ankle (as opposed to the typical up and down motion).〔〔 * Ankle (medial gastrocnemius)〔 * Patella (knee cap) * Triceps surae〔〔 * Biceps brachii〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Clonus」の詳細全文を読む スポンサード リンク
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