Extensor pollicis brevis muscle
| Extensor pollicis brevis muscle |
|---|
|
| origin |
| Posterior surface of the radius , interosseous membrane |
| approach |
| Basic link of the thumb |
| function |
| Thumb extensor |
| Innervation |
| Radial nerve from the brachial plexus |
| Spinal segments |
| C7, C8 |
The extensor pollicis brevis muscle ( Latin for "short thumb extensor") is a skeletal muscle and one of the deep extensors on the forearm . In the area of origin it is fused with the abductor pollicis longus muscle . The approach crave both muscles pull together through the first tendon sheaths compartment of the extensor retinaculum . Its attachment tendon forms the delimitation of the snuffbox on the spoke side .
The extensor pollicis brevis muscle stretches the thumb to the base and participates in its splaying.