1. Upper Arm Muscles
By: Laura Keren
PED 216

2. 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

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

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

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

6. 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

7. 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

8. 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

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

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