1. Deltoid
Origin: Anterior surface, lateral clavicle, acromion process and spine of scapula
Insertion: Deltoid tubercle of humerus
Action: Abducts humerus; aids in flexion, extension, and internal and external rotation

2. Supraspinatus Origin: Supraspinous fossa
Insertion: Greater tubercle of humerus
Action: Abducts humerus

3. Infraspinatus Origin: Infraspinous fossa
Insertion: Greater tubercle of humerus
Action: Rotates humerus laterally

4. Teres Minor Origin: Axillary border of scapula
Insertion: Greater tubercle of humerus
Action: Rotates humerus laterally

5. Teres Major Origin: Axillary border at inferior angle of scapula
Insertion: Intertubular groove of humerus
Action: Extends, adduction and medial rotates humerus.

6. Subscapularis Origin: Subscapular fossa
Insertion: Lesser tubercle of humerus
Action: Rotates humerus medially

7. Biceps Brachii
Short Head
Origin: Long head, supraglenoid tubercle; Short head, coracoid process scapula
Insertion: Radial tuberosity of the radius
Action: Flexes radius and humerus, and supinates forearm
Long Head

8. Coracobrachialis Origin: Coracoid process of scapula
Insertion: Middle third of humerus
Action: Flexes and adducts humerus

9. Triceps Brachii
Long Head
Lateral Head
Origin: Long head, infraglenoid tubercle; Lateral head, proximal portion of posterior humerus; Medial head, distal half of posterior humerus
Insertion: Olecranon process of ulna
Action: Extends humerus and ulna

10. Brachialis Origin: Anterior distal two-thirds of humerus
Insertion: Coronoid process of ulna
Action: Flexes ulna

11. Pronator Teres
Origin: Medial epicondyle of humerus and coronoid process of ulna
Insertion: Middle portion of radius
Action: Pronates and flexes forearm
Anterior, Superficial Layer

12. Flexor Carpi Radialis Origin: Medial epicondyle of humerus
Insertion: Base of second metacarpal
Action: Flexes wrist and elbow and abducts wrist
Anterior, Superficial Layer

13. Palmaris Longus Origin: Medial epicondyle of the humerus
Insertion: Palmar aponeurosis
Action: Weak flexion of wrist, tenses skin of palm
Anterior, Superficial Layer

14. Flexor Carpi Ulnaris
Origin: Medial epicondyle of humerus, olecranon process, & posterior ulna
Insertion: Pisiform, hamate, and fifth metacarpal
Action: Flexes and adducts wrist
Anterior, Superficial Layer

15. Brachioradialis Origin: Lateral supracondylar ridge
Insertion: Styloid process of radius
Action: Flexes forearm
Posterior, Superficial Layer

16. Extensor Carpi Radialis Longus
Origin: Lateral supracondylar ridge of humerus
Insertion: Second metacarpal
Action: Extends and abducts hand
Posterior, Superficial Layer

17. Extensor Carpi Radialis Brevis
Origin: Lateral epicondyle of humerus
Insertion: Third metacarpal
Action: Extends and abducts hand
Posterior, Superficial Layer

18. Extensor Digitorum Origin: Lateral epicondyle of humerus
Insertion: Into distal phalanx by 4 tendons
Action: Extends fingers and hand
Posterior, Superficial Layer

19. Extensor Carpi Ulnaris
Origin: Lateral epicondyle of humerus and posterior border of ulna
Insertion: Fifth metacarpal
Action: Extends and adducts hand
Posterior, Superficial Layer

20. The End
The End