Trapezius muscle is a triangular flat muscles of the back, controlled by the accessory nerve and nerve double neck, muscle belly of trapezius muscle all the department have a nerve branch concentration areas, connected to each other in the middle of muscle form a treaty with nerve branch of "S" shape.Muscle belly department of a large number of nerve branch dominant area but also the site of muscle spindle gathered.Muscle spindle is associated with stress point.Inactivated stress points can eliminate the pain.

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