Extrafusal muscle fiber: Difference between revisions
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innervation of central noncontractile parts by sensory nerve endings |
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'''Extrafusal muscle fiber''' is a term given to standard [[muscle fiber]]s as to distinguish them from [[intrafusal muscle fiber]]s. Extrafusal muscle fibers are innervated by [[alpha motor neuron]]s and generate tension by contracting, thereby allowing for skeletal movement. Extrafusal muscle fibers are not to be confused with [[intrafusal muscle fiber]]s which are innervated by [[gamma motor neurons]] and thus serve as a sensory [[proprioceptor]]. |
'''Extrafusal muscle fiber''' is a term given to standard [[muscle fiber]]s as to distinguish them from [[intrafusal muscle fiber]]s. Extrafusal muscle fibers are innervated by [[alpha motor neuron]]s and generate tension by contracting, thereby allowing for skeletal movement. Extrafusal muscle fibers are not to be confused with [[intrafusal muscle fiber]]s which are innervated by sensory nerve endings in central noncontractile parts and by[[gamma motor neurons]] in contratile ends and thus serve as a sensory [[proprioceptor]]. |
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The alpha motor neuron and the extrafusal muscle fibers it innervates make up the [[motor unit]]. The connection between the alpha motor neuron and the extrafusal muscle fiber is a [[neuromuscular junction]], where the neuron's signal, the [[action potential]], is transduced to the muscle fiber by the [[neurotransmitter]] [[acetylcholine]]. |
The alpha motor neuron and the extrafusal muscle fibers it innervates make up the [[motor unit]]. The connection between the alpha motor neuron and the extrafusal muscle fiber is a [[neuromuscular junction]], where the neuron's signal, the [[action potential]], is transduced to the muscle fiber by the [[neurotransmitter]] [[acetylcholine]]. |
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<ref>http://www.d.umn.edu/~jfitzake/Lectures/DMED/MuscleReceptors/AnatomyReview.html</ref> |
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==See also== |
==See also== |
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Revision as of 12:07, 31 May 2013
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| Extrafusal muscle fiber | |
|---|---|
| Details | |
| Identifiers | |
| Latin | myofibra extrafusalis |
| TH | H3.03.00.0.00007 |
| Anatomical terminology | |
Extrafusal muscle fiber is a term given to standard muscle fibers as to distinguish them from intrafusal muscle fibers. Extrafusal muscle fibers are innervated by alpha motor neurons and generate tension by contracting, thereby allowing for skeletal movement. Extrafusal muscle fibers are not to be confused with intrafusal muscle fibers which are innervated by sensory nerve endings in central noncontractile parts and bygamma motor neurons in contratile ends and thus serve as a sensory proprioceptor.
The alpha motor neuron and the extrafusal muscle fibers it innervates make up the motor unit. The connection between the alpha motor neuron and the extrafusal muscle fiber is a neuromuscular junction, where the neuron's signal, the action potential, is transduced to the muscle fiber by the neurotransmitter acetylcholine. [1]
See also
- Intrafusal muscle fiber
- Type Ia sensory fiber
- Type II sensory fiber
- Alpha motor neuron
- Gamma motor neuron
- Beta motor neuron
 | This muscle article is a stub. You can help Wikipedia by expanding it. |