Muscles of Forearm (Posterior)

Brachioradialis Origin

lateral supracondylar ridge of humerus

Brachioradialis Insertion

styloid process of radius

Brachioradialis Action

elbow flexion

Brachioradialis Innervation

radial nerve

Extensor Carpi Radialis Longus Origin

lateral supracondylar ridge of the humerus

Extensor Carpi Radialis Longus Insertion

base of metacarpal 2

Extensor Carpi Radialis Longus Action

wrist extension

radial deviation

radial flexion

Extensor Carpi Radialis Longus Innervation

radial nerve

Extensor Carpi Radialis Brevis Origin

lateral epicondyle of humerus

Extensor Carpi Radialis Longus Insertion

base of metacarpal 3

Extensor Carpi Radialis Longus Action

wrist extension

radial deviation

radial flexion

Extensor Carpi Radialis Longus Innervation

radial nerve

Extensor Digitorum Origin

lateral epicondyle of the humerus

Extensor Digitorum Insertion

dorsal surface of phalanges 2-5

Extensor Digitorum Action

wrist, MCP, IP extension

Extensor Digitorum Innervation

radial nerve

Extensor Carpi Ulnaris Origin

lateral epicondyle of humerus

Extensor Carpi Ulnaris Insertion

base of metacarpal 5

Extensor Carpi Ulnaris Action

extension of wrist

ulnar deviation

ulnar flexion

Extensor Carpi Ulnaris Innervation

radial nerve

Extensor Pollicis Longus Origin

posterior ulna and interosseous membrane

Extensor Pollicis Longus Insertion

distal phalanx of digit 1

Extensor Pollicis Longus Action

extends MCP and IP of digit 1

ADDucts and laterally rotates thumb

Extensor Pollicis Longus Innervation

radial nerve

Extensor Pollicis Brevis Origin

shaft of radius

interosseous membrane

Extensor Pollicis Brevis Insertion

proximal phalanx of digit 1

Extensor Pollicis Brevis Action

extends MCP and IP of digit 1

Extensor Pollicis Brevis Innervation

radial nerve

Extension indicis Origin

posterior surface of ulna and interosseous membrane

Extension indicis Insertion

middle and distal phalanges of index finger

Extension indicis Action

extends wrists and index finger

Extension indicis Action

extends wrists and index finger

Extension indicis Innervation

radial nerve

Abductor Pollicis Longus Origin

posterior surface or radius and ulna

interosseous membrane

Abductor Pollicis Longus Insertion

trapezium and base of metacarpal 1

Abductor Pollicis Longus Action

thumb ABDuction

thumb extension

Abductor Pollicis Longus Innervation

radial nerve