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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