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Middle Trapezius

Origin: C7-T3

Insertion: Scapula (Acromion & Superior Spine) 

Action: Scapular Retraction, Shoulder Horizontal Abduction

Innervation: C3,4 and CNXI (Accessory Nerve)

 

EMG Studies: Townsend et al., 1991 Reinold et al., 2004