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Upper Arm Muscles By: Laura Keren PED 216
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Adducts and flexes the arm
Pectoralis Major Origin: Sternum, shoulder girdle, and first six ribs Insertion: Proximal end of humerus Adducts and flexes the arm
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Extends and adducts humerus
Latissimus dorsi Insertion: Proximal end of humerus Origin: Lower spine and ilium Extends and adducts humerus
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Deltoid Origin: shoulder girdle, spine of scapula, clavicle
Insertion: proximal humerus Adducts the arm
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Abduction of humerus; stabilizes shoulder joint
Supraspinatus Origin: Supraspinous fossa of scapula Insertion: greater tubercle of humerus Abduction of humerus; stabilizes shoulder joint
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Lateral rotation of humerus; horizontal abduction of humerus
Infraspinatus Origin: Infraspinous fossa of scapula Insertion: greater tubercle of humerus Lateral rotation of humerus; horizontal abduction of humerus
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Adduction of arm; medial rotation of humerus
Subscapularis Insertion: Lesser tubercle of humerus Origin: Subscapular fossa of scapula Adduction of arm; medial rotation of humerus
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Extension; adduction; medial rotation of humerus
Teres Major Insertion: Medial lip of bicipital groove of humerus Origin: Inferior angle of scapula Extension; adduction; medial rotation of humerus
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Extension; lateral rotation humerus
Teres Minor Insertion: greater tubercle of humerus Origin: Upper 2/3 of axillary border of scapula Extension; lateral rotation humerus
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Flex and weakly adducts arm
Coracobrachialis Origin: Coracoid process Insertion: upper ½ of the medial border of humerus Flex and weakly adducts arm
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