Origin

Radius

Insertion

Thumb, proximal phalanx

Action(s)

Extension of thumb at metacarpophalangeal joint

Nerve Supply

Posterior interosseous nerve

Arterial Supply

Posterior interosseous artery

Physical Exam

Enter physical examination maneuvers for muscle

Clinical Importance

Enter clinical importance of muscle

Disease States

Enter links to pages where muscle involved

Discussion

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.

Figures

Click thumbnail for larger image

Credits:

From Wikipedia:
Extensor pollicis brevis

Attachments: