It is now accepted that the commonly known "Trigger Points" are actually the dysfunctional Spindle Fibers. The intrafusal fibers of the Spindle are in almost constant contraction tension, even when the muscle it resides in is at rest. When using a needle EMG, a high degree of muscle contraction activity can be demonstrated from *within* the Spindle, while only a millimeter away, outside the Spindle and within ordinary musculature, there is very little activity. It is widely believed that the these intrafusal fibers of the Spindle are innervated by the *sympathetic nervous system*.

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