Muscles - Acts in shoulder flexion horizontal flexion and...

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Muscles - Anterior to the Shoulder Joint MUSCLE FROM TO ACTION Pectoralis Major medial 2/3 of clavicle (clavicular) & anterior surface of sternum (sternocostal) lateral surface of humerus just below head Clavicular portion - acts in flexion, horizontal flexion, and inward rotation of shoulder. When humerus is above 110 ° of abduction these fibers act to abduct the shoulder. Sternocostal portion - acts in adduction, flexion, and horizontal flexion (diminishes as movement progresses) of the shoulder, and medial rotation when accompanied by adduction. This muscle is most powerful in the sagittal plane - for pushing, throwing, and punching. Coracobrachialis coracoid process of scapula inner surface of humerus (opposite deltoid) Line of pull in front of shoulder.
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Unformatted text preview: Acts in shoulder flexion, horizontal flexion, and is a stabilizer of the shoulder joint. Subscapularis entire anterior surface of scapula lesser tuberosity of humerus Line of pull - below shoulder joint. Acts as a "rotator cuff" muscle. Is a stabilizer of the shoulder joint in prevention of dislocations. Depresses humeral head during abduction and flexion. Its main action is as an inward rotator. Biceps Brachii long head - upper margin of glenoid fossa short head - apex of coracoid process of scapula bicipital tuberosity of the radius Line of pull - in front of shoulder joint. Action is primarily on the elbow but is bi-articular. Acts in shoulder flexion, horizontal flexion, and abduction with an extended elbow....
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