MUSCLES OF LOWER ARM AND HANDFlexors and Extensors

FlexorsMuscle Position Action

Flexor carpi radialis

Middle of forearm

Flexes and abducts the wrist

Flexor carpi ulnaris

Front of forearm

Flex and adducts the wrist joint in towards the body

Flexor carpi digitorum

Muscle Position Action

Flexor carpi digitorum

Front of fingers

Flexes the fingers when contracted

Palmaris longus

Muscle Position Action

Palmaris longus

Middle of front of forearm

Flexes the wrist and tenses the palm of the hand

Muscle Position Action

Thenar muscle

Palm of hand below thumb

Flexes the thumb and moves it outwards and inwards

Hypothenar muscle

Palm of hand below little finger

Flexes the little finger and moves it outwards and inwards

Extensors

Extensor carpi ulnaris Extensor carpi radialis

Muscle Position Action

Extensor carpi ulnaris

Back of the forearm

Extends and adducts the wrist

Extensor carpi radialis

Thumb side of forearm

Extends and abducts hand and wrist

Extensor digitorum

Muscle Position Action

Extensor digitorum

Back of fingers

Extends the fingers when contracted