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Extensor Pollicis Brevis

Extensor Pollicis Brevis

Description

Origin :

  • Posterior surfaces of radius and interosseous membrane.

Insertion :

  • Base of proximal 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

Action

Action :

  • Extends proximal phalanx of thumb at carpometacarpal joint.
Target Muscles Target MusclesExtends four toes