Extensor pollicis brevis muscle
Extensor pollicis brevis muscle |
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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.