Extrafusal muscle fibers
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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.
[edit] External links
skeletal muscle/general: epimysium, fascicle, perimysium, endomysium, muscle fiber, myofibril
sarcomere (a, i, and h bands; z and m lines), myofilaments (thin filament/actin, thick filament/myosin, elastic filament/titin), tropomyosin, troponin
neuromuscular junction, intrafusal muscle fiber, extrafusal muscle fiber, motor unit, muscle spindle, sliding filament mechanism
myoblast, satellite cells, sarcoplasm, sarcolemma, sarcoplasmic reticulum, T-tubule
| This page uses content from the English-language version of Wikipedia. The original article was at Extrafusal muscle fiber. The list of authors can be seen in the page history. As with Psychology Wiki, the text of Wikipedia is available under the GNU Free Documentation License. |
