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extrafusal |
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extrafusal situated outside a striated muscle spindle. |
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| Some authors (28,29) have theorized that muscle-specific spindle alterations may be the result of local denervation, as research has demonstrated an increased proportion of type I extrafusal muscle fibers observed within the deltoid and extensor digitorum brevis muscles with age. 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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