Table of Muscles

Muscle Origin Insertion Nerve supply Action
brachioradialis lateral supracondylar ridge of humerus styloid process of radius radial flexes forearm and supinates hand
extensor carpi radialis longus lateral supracondylar ridge of humerus base of 2nd metacarpal radial extends and abducts the wrist
extensor carpi radialis brevis lateral epicondyle of humerus base of 3rd metacarpal radial extends and abducts the wrist
extensor carpi ulnaris lateral epicondyle of humerus
posterior border of ulna		 base of 5th metacarpal radial extends and adducts the hand
extensor digitorum lateral epicondyle of humerus extensor expansion over fingers radial extends fingers, hand and forearm
extensor digiti minimi lateral epicondyle of humerus extensor expansion of little finger radial extends little finger
anconeus back of lateral epicondyle of humerus olecranon process
poster surface of ulna		 radial extends forearm
supinator lateral epicondyle of humerus
crest of ulna		 upper third of radius radial supinates the hand
abductor pollicis longus posterior surface of ulnar
middle aspect of radius		 base of 1st metacarpal radial abducts thumb
extensor pollicis brevis middle 1/3rd of radius base of proximal phalanx of thumb radial extends thumb
extensor pollicis longus middle 1/3rd ulna & interosseous membrane base of distal phalanx of thumb radial extends thumb
extensor indicis posterior surface of ulna extensor expansion of index finger radial extends index finger
abductor pollicis brevis (thenar muscle) flexor retinaculum of wrist
scaphoid & trapezium		 proximal phalanx of thumb median abducts the thumb
flexor pollicis brevis (thenar muscle) flexor retinaculum
trapezium		 proximal phalanx of thumb median flexes the thumb
opponens pollicis (thenar muscle) trapezium & flexor retinaculum lateral border of 1st metacarpal median opposes thumb to other digits
adductor pollicis capitate
2nd & 3rd metacarpals		 proximal phalanx of thumb ulnar adducts the thumb
abductor digiti minimi (hypothenar muscle) pisiform proximal phalanx of little finger ulnar abducts little finger
flexor digiti minimi (hypothenar muscle) flexor retinaculum
hook of hamate		 proximal phalanx of little finger ulnar flexes little finger
opponens digiti minimi (hypothenar muscle) flexor retinaculum
hook of hamate		 5th metacarpal ulnar opposes little finger to other digits
palmar interosseus I medial side of 2nd metacarpal medial base of index finger ulnar adducts index finger towards middle finger
interosseous II lateral side of 4th metacarpal lateral base of ring finger ulnar adducts ring finger towards middle finger
interosseous III lateral side of 5th metacarpal medial base of little finger ulnar adducts little finger towards middle finger
dorsal interosseous I adjacent sides of metacarpal bones lateral aspect of extensor expansion of ring finger ulnar abducts ring finger away from middle finger
dorsal interosseous II adjacent sides of metacarpal bones medial aspect of extensor expansion of middle finger ulnar abducts the middle finger away from its long axis
dorsal interosseous III adjacent sides of metacarpal bones lateral aspect of extensor expansion of middle finger ulnar abducts the middle finger away from its long axis
dorsal interosseous IV adjacent sides of metacarpal bones lateral aspect of extensor expansion of index finger ulnar abducts the index finger away from the middle finger
lumbricals I & II tendons of flexor digitorum superficialis lateral aspect of extensor expansion median flex the metacarpophalangeal joint extend the interphalangeal joints
lumbricals III & IV tendons of flexor digitorum superficialis lateral aspect of extensor expansion ulnar flex the metacarpophalangeal joint extend the interphalangeal joints

Muscles of Posterior Forearm Nerves of Posterior Forearm


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