Muscles - Arm and Forearm

Muscles of the Arm and Forearm

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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AndyC	Latest page update: made by AndyC , Jul 8 2010, 9:18 AM EDT (about this update About This Update Edited by AndyC 152 words added view changes - complete history)
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