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

Muscles of Posterior Forearm Nerves of Posterior Forearm


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