Upper Arm Muscles By: Laura Keren PED 216

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

Extends and adducts humerus Latissimus dorsi Insertion: Proximal end of humerus Origin: Lower spine and ilium Extends and adducts humerus

Deltoid Origin: shoulder girdle, spine of scapula, clavicle Insertion: proximal humerus Adducts the arm

Abduction of humerus; stabilizes shoulder joint Supraspinatus Origin: Supraspinous fossa of scapula Insertion: greater tubercle of humerus Abduction of humerus; stabilizes shoulder joint

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

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

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

Extension; lateral rotation humerus Teres Minor Insertion: greater tubercle of humerus Origin: Upper 2/3 of axillary border of scapula Extension; lateral rotation humerus

Flex and weakly adducts arm Coracobrachialis Origin: Coracoid process Insertion: upper ½ of the medial border of humerus Flex and weakly adducts arm