1

• 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

Deltoid

2

• Origin: Supraspinous fossa

• Insertion: Greater tubercle of humerus

• Action: Abducts humerus

Supraspinatus

3

• Origin: Infraspinous fossa

• Insertion: Greater tubercle of humerus

• Action: Rotates humerus laterally

Infraspinatus

4

• Origin: Axillary border of scapula

• Insertion: Greater tubercle of humerus

• Action: Rotates humerus laterally

Teres Minor

5

• Origin: Axillary border at inferior angle of scapula

• Insertion: Intertubular groove of humerus

• Action: Extends, adduction and medial rotates humerus.

Teres Major

6

• Origin: Subscapular fossa

• Insertion: Lesser tubercle of humerus

• Action: Rotates humerus medially

Subscapularis

7

• Origin: Long head, supraglenoid tubercle;Short head, coracoid process scapula

• Insertion: Radial tuberosity of the radius

• Action: Flexes radius and humerus, and supinates forearm

Biceps BrachiiShort Head Long

Head

8

• Origin: Coracoid process of scapula

• Insertion: Middle third of humerus

• Action: Flexes and adducts humerus

Coracobrachialis

9

• 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

Triceps Brachii Long Head

Lateral Head

10

• Origin: Anterior distal two-thirds of humerus

• Insertion: Coronoid process of ulna

• Action: Flexes ulna

Brachialis

11

• Origin: Medial epicondyle of humerus and coronoid process of ulna

• Insertion: Middle portion of radius

• Action: Pronates and flexes forearm

Pronator Teres

Anterior, Superficial Layer

12

• Origin: Medial epicondyle of humerus

• Insertion: Base of second metacarpal

• Action: Flexes wrist and elbow and abducts wrist

Flexor Carpi Radialis

Anterior, Superficial Layer

13

• Origin: Medial epicondyle of the humerus

• Insertion: Palmar aponeurosis

• Action: Weak flexion of wrist, tenses skin of palm

Palmaris Longus

Anterior, Superficial Layer

14

• Origin: Medial epicondyle of humerus, olecranon process, & posterior ulna

• Insertion: Pisiform, hamate, and fifth metacarpal

• Action: Flexes and adducts wrist

Flexor Carpi Ulnaris

Anterior, Superficial Layer

15

• Origin: Lateral supracondylar ridge

• Insertion: Styloid process of radius

• Action: Flexes forearm

Brachioradialis

Posterior, Superficial Layer

16

• Origin: Lateral supracondylar ridge of humerus

• Insertion: Second metacarpal

• Action: Extends and abducts hand

Extensor Carpi Radialis Longus

Posterior, Superficial Layer

17

• Origin: Lateral epicondyle of humerus

• Insertion: Third metacarpal

• Action: Extends and abducts hand

Extensor Carpi Radialis Brevis

Posterior, Superficial Layer

18

• Origin: Lateral epicondyle of humerus

• Insertion: Into distal phalanx by 4 tendons

• Action: Extends fingers and hand

Extensor Digitorum

Posterior, Superficial Layer

19

• Origin: Lateral epicondyle of humerus and posterior border of ulna

• Insertion: Fifth metacarpal

• Action: Extends and adducts hand

Extensor Carpi Ulnaris

Posterior, Superficial Layer

20

The End