extensor carpi radialis brevis muscle

Extensor carpis radialis brevis (ECRB) muscle is a muscle of the superficial layer of the posterior compartment of the forearm. It passes through the 2extensor compartment of the wrist. Extensor carpi radialis brevis muscle is one of the three muscles forming the mobile wad of Henry. It is one of the extrinsic muscles of the hand.


  • origin: lateral epicondyle of the humerus, annular ligament of the radius
  • insertion: base of 3 metacarpal on posterior surface with direct relationship with ECRL which inserts into the base of 2 metacarpal
  • innervation: deep branch of radial nerve, C7, C8
  • action: extension and abduction of the wrist joint; extensor carpi radialis brevis muscle is a prime extensor of the wrist
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