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From Simple English Wikipedia, the free encyclopedia

A fasciculation, or "muscle twitch", is a small, local, involuntary muscle contraction and relaxation. At times it may be visible under the skin. Deeper areas can be detected by EMG testing. A fasciculation can happen in any skeletal muscle in the body. Fasciculations can occur in normal healthy people.[1] One uncommon reason for them is due to a lower motor neuron lesion that may be caused by any of several diseases. One example would be Amyotrophic Lateral Sclerosis.


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  1. Sabyasachi Sircar, Principles of Medical Physiology (Stuttgart; New York: Thieme, 2008), p. 116

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