Muscles Posterior to the Shoulder Joint

Muscles Posterior to the Shoulder Joint - become the...

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Muscles Posterior to the Shoulder Joint MUSCLE FROM TO ACTION Infraspinatus and Teres minor (act as one) axillary border and posterior surface of scapula below scapular spine posterior aspect of greater tuberosity of humerus Acts in outward rotation, depression of the humeral head to prevent jamming into the acromion process during flexion and abduction, and is part of the "rotator cuff" muscles so therefore stabilizes the joint and prevents dislocation when the humerus is abducted.
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Muscles Inferior to the Shoulder Joint MUSCLE FROM TO ACTION Latissimus Dorsi spinous process of lower six thoracic vertebrae and all lumbar vertebrae, posterior surface of sacrum, crest of ilium, and the lower three ribs anterior surface of humerus below head anterior to tendon of pectoralis major Broad sheet of muscle. The fibers twist as they pass by axilla and the lower fibers
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Unformatted text preview: become the uppermost. The line of action favors extension and adduction, especially when the shoulder is in 30-90 ° of flexion. Teres Major posterior surface of inferior angle of scapula anterior surface of humerus below head, just medial to latissimus dorsi tendon Acts as an inward rotator of the shoulder, in adduction, and in extension. Also acts in hyper-extension and adduction when the upper extremity is behind the back Triceps Brachii (biarticular over the shoulder and elbow) long head- infraglenoid tuberosity lateral head- posterior surface of upper of humerus medial head- posterior surface of lower 2/3 of humerus olecranon process of ulna. The long head crosses the shoulder joint Primarily an elbow extensor. Also assists in shoulder adduction, extension, and hyper- extension....
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This note was uploaded on 09/25/2010 for the course EXS 31757 taught by Professor Brennan during the Spring '10 term at Oakland University.

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Muscles Posterior to the Shoulder Joint - become the...

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