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Extensor Pollicis Brevis
Region: Forearm & Hand Muscles · All forearm & hand muscles
Extensor Pollicis Brevis at a glance
| Origin | Back surface of the radius and the interosseous membrane |
|---|---|
| Insertion | Base of the proximal phalanx of the thumb |
| Actions | Straightens the thumb at the knuckle (MCP joint); Helps move the thumb away from the palm |
| Nerve supply | Posterior interosseous nerve (C7–C8) |
◆ Good to know
With abductor pollicis longus it shares the first tendon compartment at the wrist — the pair inflamed in De Quervain's tenosynovitis.
More Forearm & Hand Muscles
Please note: This page is an anatomy education summary for students and curious readers, not medical advice. Attachment points are given in their classic short form; individual anatomy varies, and detailed dissection-level descriptions belong in an anatomy atlas.