Extensor carpi radialis brevis muscle

Greg Mirt et al.

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

Summary

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

Upper limb anatomy
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Article Information

rID: 39869
Section: Anatomy
Tag: anatomy
Synonyms or Alternate Spellings:
  • ECRB
  • ECRB muscle
  • Extensor carpi radialis brevis

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Cases and Figures

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    Figure 1: extensor compartments of the wrist
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