The |extensor carpi ulnaris| is a superficial muscle on the forearm. It is a narrow, elongated, flattened muscle that extends from the |humerus| (upper arm bone) to the base of the fifth metacarpal bone of the little finger where it inserts via a flat, narrow ~tendon~. The ~tendon~ begins three-fourths of the way down the forearm. This muscle helps extend the wrist.
