Extensor pollicis brevis

Radius

Thumb, proximal phalanx

Extension of thumb at metacarpophalangeal joint

Posterior interosseous nerve

Posterior interosseous artery

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Absence; fusion of tendon with that of the Extensor pollicis longus.

It arises from the dorsal surface of the body of the radius below that muscle, and from the interosseous membrane.

Its direction is similar to that of the Abductor pollicis longus, its tendon passing the same groove on the lateral side of the lower end of the radius, to be inserted into the base of the first phalanx of the thumb.