Posterior Forearm Flashcards
The muscles in posterior forearm are organised into 3 functional groups
1) Muscles that extend and abduct or adduct the hand at the wrist joint
2) Muscles that extend the medial four digits
3) Muscles that extend or abduct the thumb
What is the action of extensor carpi radialis longus and brevis on the wrist joint?
They both extend and abduct/adduct the wrist joint.
What other action are extensor carpi radialis longus and brevis involved with the help of flexor carpi radialis?
radial deviation of wrist
Which muscles extend medial four digits
Extensor digitorum
Extensor indicis
Extensor digiti minimi
Extensor Digitorum Action
Is an extensor of the fingers and of the wrist
Extensor Digitorum arises from
common extensor origin on the lateral epicondyle of the humerus.
Muscles that extend or abduct thumb
Abductor pollicis longus (APL)
Extensor pollicis brevis (EPB)
Extensor pollicis longus (EPL)
Innervation of
- Extensor Digitorum
- Extensor Carpi Radialis Longus
- Extensor Carpi Radialis Brevis
- Brachioradialis
- Extensor Carpi Ulnaris
- Supinator
- Extensor Digiti Minimi
Radial Nerve
Action of extensor digitorum
Extend medial 4 digits at MCP joints
action of extensor carpi radialis longus
extend and abduct wrist
extensor carpi radialis brevis action
extend and abduct wrist
brachioradialis action
flexes elbow
extensor carpi ulnaris action
extend and adduct wrist
extensor digiti minimi action
extend 5th finger at MP joint
