Clonus (from the Greek klonos, meaning “violent”, “confused motion”) is a form of rapid succession of contractions and relaxations of a muscle after a forced passive muscle stretch. It may be caused by neurologic conditions. Usually, it is linked to upper motor pathologic conditions such as stroke, multiple sclerosis, spinal cord damage or liver encephalopathy. Clonic relates to clonus; an example is the term clonic seizure, which is a seizure characterized by repetitive rhythmical jerking of all or part of the body. Synonym: clonospasm.
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