Upper Arm Muscles

By: Laura KerenPED 216

Pectoralis Major

Origin: Sternum, shoulder girdle, and first six ribs

Insertion: Proximal end of humerus

Adducts and flexes the arm

Latissimus dorsi

Origin: Lower spine and ilium

Insertion: Proximal end of humerus

Extends and adducts humerus

Deltoid

Origin: shoulder girdle, spine of scapula, clavicle Insertion: proximal

humerus

Adducts the arm

Supraspinatus

Origin: Supraspinous fossa of scapula

Insertion: greater tubercle of humerus

Abduction of humerus; stabilizes shoulder joint

Infraspinatus

Origin: Infraspinous fossa of scapula

Insertion: greater tubercle of humerus

Lateral rotation of humerus; horizontal abduction of humerus

Subscapularis

Origin: Subscapular fossa of scapula

Insertion: Lesser tubercle of humerus

Adduction of arm; medial rotation of humerus

Teres Major

Origin: Inferior angle of scapula

Insertion: Medial lip of bicipital groove of humerus

Extension; adduction; medial rotation of humerus

Teres Minor

Origin: Upper 2/3 of axillary border of scapula

Insertion: greater tubercle of humerus

Extension; lateral rotation humerus

Coracobrachialis

Origin: Coracoid process

Insertion: upper ½ of the medial border of humerus

Flex and weakly adducts arm