Extensor carpi radialis longus muscle

Last revised by Yoshi Yu on 17 Jan 2023

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


  • origin: lateral supracondylar ridge of humerus, lateral epicondyle of humerus, lateral intermuscular septum of arm

  • insertion: base of 2nd metacarpal on its posterior surface with direct relationship with ECRB which inserts onto the base of the 3rd metacarpal.

  • arterial supply: radial recurrent artery

  • innervation: radial nerve (C6, C7)

  • action: extension and abduction of the wrist joint

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