Extensor Pollicis Brevis

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The Extensor Pollicis Brevis is a deep muscle of the posterior forearm.

Anatomical Attachments:

• Origin: Attaches to the dorsal surface of the radius and the interosseus membrane.
• Insertion: Attaches into the base of the first phalanx of the thumb.

Action: Extends the thumb.

Synergist: Brachioradialis, Supinator, Extensor Carpi radialis brevis and longus, Abductor pollicis longus, Extensor pollicis longus, Extensor digitorum, Extensor digiti minimi, Extensor carpi ulnaris, Extensor indicis.

Antagonist: Pronator teres, Flexor carpi radialis, Palmaris longus, Flexor carpi ulnaris, Flexor digitorum superficialis, Flexor digitorum profundus, Flexor pollicis longus, Pronator quadratus.

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Nerve Supply: Radial nerve (C6, C7).

Vascular supply: Posterior interosseus of the ulnar artery.

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