Several muscles contribute to wrist abduction, also known as radial deviation.
Muscles Responsible for Wrist Abduction
The muscles that cause the wrist to abduct (move the hand away from the midline of the body in the direction of the thumb) are found in both the anterior and posterior compartments of the forearm. These include:
- Flexor Carpi Radialis: Located in the anterior compartment of the forearm.
- Extensor Carpi Radialis Longus: Located in the posterior compartment of the forearm.
- Extensor Carpi Radialis Brevis: Located in the posterior compartment of the forearm.
- Abductor Pollicis Longus: Also located in the posterior compartment of the forearm.
Explanation
Wrist abduction involves the movement of the hand at the wrist joint, such that it is moved towards the radial (thumb) side of the forearm. This motion is essential for various daily activities and hand movements. The muscles listed above work synergistically to produce this movement.
The flexor carpi radialis, primarily known for wrist flexion, also aids in abduction. The extensor carpi radialis longus and brevis muscles are major contributors to radial deviation and wrist extension. Additionally, the abductor pollicis longus, although mostly for thumb movement, also participates in wrist abduction.
| Muscle | Compartment | Primary Action | Role in Abduction |
|---|---|---|---|
| Flexor Carpi Radialis | Anterior | Wrist Flexion | Contributes to Abduction |
| Extensor Carpi Radialis Longus | Posterior | Wrist Extension | Major Abductor |
| Extensor Carpi Radialis Brevis | Posterior | Wrist Extension | Major Abductor |
| Abductor Pollicis Longus | Posterior | Thumb Abduction | Contributes to Abduction |
These muscles, while having other primary actions, play a crucial role in the controlled and balanced abduction of the wrist.
