extensor carpi ulnaris (muscle)

(redirected from ulnar extensor (muscle) of wrist)

ex·ten·sor car·pi ul·na·ris (mus·cle)

muscle of posterior (extensor) compartment of forearm; origin, lateral epicondyle of humerus (humeral head) and oblique line and posterior border of ulna (ulnar head); insertion, base of fifth metacarpal bone; action, extends and adducts hand at wrist joint; nerve supply, radial (posterior interosseous).