Coracobrachialis
- Origin - Coracoid process
- Insertion - Middle third of medial surface of humerus
- Nerve - Musculocutaneous
- Action - Flexes and adducts arm
Biceps brachii
- Origin - Long head, supraglenoid tubercle; short head, coracoid process
- Insertion - Radial tuberosity of radius
- Nerve - Musculocutaneous
- Action - Flexes arm and forearm, supinates forearm
Brachialis
- Origin - Lower anterior surface of humerus
- Insertion - Coronoid process of ulna and ulnar tuberosity
- Nerve -Musculocutaneous
- Action - Flexes forearm
Triceps
- Origin - Long head, infraglenoid tubercle; lateral head, superior to radial groove of humerus; medial head,Insertion - inferior to radial groove
- Insertion - Posterior surface of olecranon process of ulna
- Nerve - Radial
- Action - Extends forearm
Anconeus
- Origin - Lateral epicondyle of humerus
- Insertion - Olecranon and upper posterior surface of ulna
- Nerve - Radial
- Action - Extends forearm
Pronator teres
- Origin - Medial epicondyle and coronoid process of ulna
- Insertion - Middle of lateral side of radius
- Nerve - Median
- Action - Pronates and flexes forearm
Flexor carpi radialis
- Origin - Medial epicondyle of humerus
- Insertion - Bases of second and third metacarpals
- Nerve - Median
- Action - Flexes forearm, flexes and abducts hand
Palamaris longus
- Origin - Medial epicondyle of humerus
- Insertion - Flexor retinaculum, palmar aponeurosis
- Nerve - Median
- Action - Flexes forearm and hand
Flexor carpi ulnaris
- Origin - Medial epicondyle (humeral head); medial olecranon, and posterior border of ulna (ulnar head)
- Insertion - Pisiform, hook of hamate, and base of fifth metacarpal
- Nerve - Ulnar
- Action - Flexes forearm; flexes and adducts hand
Flexor digitorum superficialis
- Origin - Medial epicondyle, coronoid process, oblique line of radius
- Insertion - Middle phalanges of finger
- Nerve - Median
- Action - Flexes proximal interphalangeal joints, flexes hand and forearm
Flexor digitorum profundus
- Origin - Anteromedial surface of ulna, interosseous membrane
- Insertion - Bases of distal phalanges of fingers
- Nerve - Ulnar and median
- Action - Flexes distal interphalangeal joints and hand
Flexor pollicis longus
- Origin - Anterior surface of radius, interosseous membrane, and coronoid process
- Insertion - Base of distal phalanx of thumb
- Nerve - Median
- Action - Flexes thumb
Pronator quadratus
- Origin - Anterior surface of distal ulna
- Insertion - Anterior surface of distal radius
- Nerve - Median
- Action - Pronates forearm
Brachioradialis
- Origin - Lateral supracondylar ridge of humerus
- Insertion - Base of radial styloid process
- Nerve - Radial
- Action - Flexes forearm
Extensor carpi radialis longus
- Origin - Lateral supracondylar ridge of humerus
- Insertion - Dorsum of base of second metacarpal
- Nerve - Radial
- Action - Extends and abducts hand
Extensor carpi radialis brevis
- Origin - Lateral epicondyle of humerus
- Insertion - Posterior base of third metacarpal
- Nerve - Radial
- Action - Extends and abducts hands
Extensor digitorium
- Origin - Lateral epicondyle of humerus
- Insertion - Extensor expansion, base of middle and digital phalanges
- Nerve - Radial
- Action - Extends fingers and hand
Extensor digiti minimi
- Origin - Common extensor tendon and interosseous membrane
- Insertion - Extensor expansion, base of middle and distal phalanges
- Nerve - Radial
- Action - Extends little finger
Extensor carpi ulnaris
- Origin - Lateral epicondyle and posterior surface of ulna
- Insertion - Base of fifth metacarpal
- Nerve - Radial
- Action - Extends and adducts hand
Supinator
- Origin - Lateral epicondyle, radial collateral and annular ligaments, supinator fossa and crest of ulna
- Insertion - Lateral side of upper part of radius
- Nerve - Radial
- Action - Supinates forearm
Abductor pollicis longus
- Origin - Interosseous membrane, middle third of posterior surfaces of radius and ulna
- Insertion - Lateral surface of base of first metacarpal
- Nerve - Radial
- Action - Abducts thumb and hand
Extensor pollicis longus
- Origin - Interosseous membrane and middle third of posterior surface of ulna
- Insertion - Base of distal phalanx of thumb
- Nerve - Radial
- Action - Extends distal phalanx of thumb and abducts hand
Extensor pollicis brevis
- Origin - Interosseous membrane and posterior surface of middle third of radius
- Insertion - Base of proximal phalanx of thumb
- Nerve - Radial
- Action - Extends proximal phalanx of thumb and abducts hand
Extensor indicis
- Origin - Posterior surface of ulna and interosseous membrane
- Insertion - Extensor expansion of index finger
- Nerve - Radial
- Action - Extends index finger
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