Muscles Superior to the Shoulder Joint

Muscles Superior to the Shoulder Joint - horizontal...

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Muscles Superior to the Shoulder Joint MUSCLE FROM TO ACTION Deltoid (3 heads) anterior - anterior outer 1/3 of clavicle middle - acromion process and outer end of clavicle posterior - lower margin of spine of scapula lateral aspect of humerus near midpoint anterior - all forward movements of arm including flexion and horizontal flexion, also inward rotation middle - Multipenniform structure gives it great strength without bulk, powerful abductor, poor angle of pull (about 15-25 ° ) for movement but is great for stabilization. Also acts in
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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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Muscles Superior to the Shoulder Joint - horizontal...

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