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Extrafusal muscle fibers are a class of muscle fiber innervated by alpha motor neurons.
They generate tension, do mechanical work and allow for movement by contracting.
Compare with intrafusal muscle fiber - is of sensory type and innervated by gamma motor neurons.
Extrafusal muscle fibers and associated alpha motor neurons are called a motor unit. The connection between alpha motor neuron and extrafusal muscle fiber is a neuromuscular junction, and the neurotransmitter responsible for contraction is acetylcholine.
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- This page was last modified on 12 October 2008, at 07:19.
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