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extrafusal |
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extrafusal situated outside a striated muscle spindle. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Muscle spindles are composed of a connective tissue capsule and intrafusal fibers, which are juxtaposed and parallel to extrafusal or ordinary muscle fibers (Tab. With respect to the action of botulinum toxin A, it is suggested that the effect of the toxin could be mediated by paresis of both the extrafusal and intrafusal muscle fibres, thereby altering the afferent discharge in the muscle. Although it is unknown whether this innervation occurs in the muscles of humans, this finding suggests the need for research in explaining symptoms of widespread local tension, previously attributed to extrafusal muscle fiber when exacerbated by stress (de, trauma, lack of sleep, exercise). |
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