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Unformatted text preview: horizontal extension to maintain arm position. posterior - Extension and lateral rotation. Forceful adduction of shoulder from an overhead position Supraspinatus medial 2/3 of supra spinatus fossa above scapular spine top of greater tuberosity of humerus Acts in shoulder abduction, as well as flexion and horizontal extension to stabilize the shoulder. It is also a part of the "rotator cuff" muscles so it prevents downward dislocation....
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- Spring '10