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image: Extensor Pollicis Longus
Extensor Pollicis Longus

Extensor Pollicis Longus

 Articulations :

 Action :

  • Extends distal phalanx of thumb at carpometacarpal and interphalangeal joints.

Origin :

  • Posterior surface of middle 1/3 of ulna and interosseous membrane.

Insertion :

  • Base of distal phalanx of thumb.

Innervation :

  • Posterior interosseous nerve (C7 and C8).
  • The continuation of the deep branch of the radial nerve

Arterial Supply :

  • Posterior interosseous artery.

Depth :

  • Superficial
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