Abductor Pollicis Longus

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The Abductor Pollicis Longus is a deep muscle of the posterior forearm.

Anatomical Attachments:

• Origin: Attaches to the posterior aspect of the ulnar, the interosseus membrane and the posterior surface of the radius.
• Insertion: Attaches to the base of the 1st metacarpal bone.

Action: Abducts and extends the thumb, abducts the wrist.

Synergist: Flexor digitorum superficialis and profundus, Flexor pollicis longus.

Antagonist: Flexor carpi radialis, Flexor carpi ulnaris, Palmaris longus.

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Nerve Supply: Radial nerve (C6, C7).

Vascular supply: Posterior interosseus of the ulnar artery.

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