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...ents and can affect the hands, arms, eyes, face, head, vocal folds, trunk, and legs. ...ecting the hands and head but can also cause trembling in the voice, arms, and legs.

...medical term for a brief, involuntary twitching of a muscle or a group of muscles. Jerks are a type of myoclonus. ...ions and relaxations. Clonus is a sign of certain neurological conditions, and is therefore related to jerks.