Extensor pollicis brevis muscle

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Extensor pollicis brevis muscle
Musculus extensorpollicisbrevis.png
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.