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Glossary of Physiology Terms -
Motor unit

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Motor unit

Definition:
A motor unit is composed of a motor neuron and all of the muscle fibers (i.e., muscle cells) it innervates.

Alternatively, a motor unit is a group of muscle fibers innervated by a single motor neuron.




Posted: Tuesday, February 4, 2014
Last updated: Wednesday, March 12, 2025
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