extensor carpi ulnaris (muscle)
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).
Synonym(s): musculus extensor carpi ulnarisTA, ulnar extensor (muscle) of wrist
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