Actions At The Wrist Joint And Forearm Muscle Actions

Front 1

flexion of the wrist

Back 1

flexor carpi ulnaris

flexor carpi radialis

Front 2

extension of the wrist

Back 2

extensor carpi ulnaris

extensor carpi radialis longus

extensor carpi radialis brevis

Front 3

abduction of the wrist (radial deviation)

Back 3

flexor carpi radialis

extensor carpi radialis longus

extensor carpi radialis brevis

Front 4

adduction of the wrist (ulna deviation)

Back 4

flexor carpi ulnaris

extensor carpi ulnaris

Front 5

pronator teres

Back 5

pronation (and helps flex forearm at elbow)

Front 6

pronator quadratus

Back 6

pronation

Front 7

supinator

Back 7

supination

Front 8

flexor carpi radialis

Back 8

flexion at wrist joint and aids wrist abduction

Front 9

palmaris longus

Back 9

Flexes hand at wrist jointand tightens palmer aponeurosis

Front 10

flexor digitorum superficialis

Back 10

Flexor of proximalinterphalangeal joint. Contribution to flexion of all joint it crosses (elbow,wrist and metacarpophalangeal joints)

Front 11

flexor carpi ulnaris

Back 11

Flexes and adducts hand atwrist

Front 12

flexor pollicis longus

Back 12

Abduction of the wrist;flexion of the carpometacarpal, metacarpophalangeal and interphalangeal jointsof the 1st digit.

Front 13

flexor digitorum profundus

Back 13

Fexion of the wrist,flexion of the metacarpophalangeal, proximal interphalangeal and distalinterphalangeal joints of the 2nd-5th digits.

Front 14

brachioradialis

Back 14

Flexion of the elbow;supination and pronation of the forearm.

Front 15

extensor carpi radialis longus

Back 15

extension and abduction ofthe wrist

Front 16

extensor carpi radialis brevis

Back 16

Extends and abducts hand atwrist joint

Front 17

extensor digitorum

Back 17

Extension of wrist at themetacarpophalangeal and interphalangeal joints of 2nd-5th digits and abductionof fingers

Front 18

extensor digiti minimi

Back 18

Extends 5th digit at themetacarpophalangeal and interphalangeal joints

Front 19

extensor carpi ulnaris

Back 19

Extends and adducts thehand at the wrist

Front 20

abductor pollicis longus

Back 20

Abduction of theradiocarpal joint and carpometacarpal joint of the 1st digit.

Front 21

extensor pollicis brevis

Back 21

Extends 1st digit (thumb)

Front 22

extensor pollicis longus

Back 22

Extension of hand,extension of thumb at metacarpophalangeal and interphalangeal joints

Front 23

extensor indicis

Back 23

Extension of the wrist;extension of the metacarpophalangeal, proximal interphalangeal and distalinterphalangeal joints of the 2nd digit.