Involuntary, brief muscle contractions or twitches that are visible under the skin. These occur when motor units fire spontaneously without conscious control.
From Latin 'fasciculus' meaning 'small bundle' plus '-ation' suffix. The term reflects how muscle fibers are organized in small bundles that contract together when stimulated.
Fasciculations are like tiny electrical storms in your muscles - they're actually the dying gasps of motor neurons! When you see that eyelid twitch or thumb jump, you're witnessing individual nerve cells misfiring as they struggle to maintain control over their muscle fibers.
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