Fasciculations refer to involuntary, brief, and spontaneous muscle contractions or twitches that involve small groups of muscle fibers. These twitches are visible under the skin and can happen in any muscle of the body, but they often occur in the arms, legs. Unlike myokymia, which typically involves finer muscle fibers like those around the eyes. Local Twitch Response (LTR) refers to an involuntary, reflexive contraction of a muscle or a portion of a muscle that occurs when a trigger point is s

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