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Fasciculation

August 3, 2010
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fasciculation /fəˌsɪkjʉˈleɪʃən/, or “muscle twitch“, is a small, local, involuntary muscle contraction and relaxation visible under the skin arising from the spontaneous discharge of a bundle of skeletal muscle fibers (muscle fascicle). Fasciculations have a variety of causes, the majority of which are benign, but can also be due to disease of the motor neurons.

Wikipedia

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