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Knowledge of muscular variations in the antebrachial region is clinically significant in certain operative procedures like tendon transfer, correction of hand deformities. Extensor carpi radialis accessorius and extensor carpi radialis intermedius were reported variations of extensor region. We present a rare variation of extensor carpi radialis longus, which was inserted into the fibrous flexor sheath of middle, ring, and little fingers on the palmar aspect. The present variation will influence the biomechanics of wrist joint.