The extensor digiti minimi muscle is an accessory extensor of the little finger and is medial to the extensor digitorum in the forearm (Fig. 7.90). It originates from the lateral epicondyle of the humerus and inserts, together with the tendon of the extensor digitorum, into the extensor hood of the little finger.
The extensor digiti minimi is innervated by the posterior interosseous nerve (Table 7.13).