flexor digiti minimi brevis, 1. short flexor muscle of little finger; a muscle that inserts on the medial side of the proximal phalanx of the finger to flex it and is innervated by the ulnar nerve. 2. short flexor muscle of little toe; a muscle that inserts on the lateral surface of the base of the proximal phalanx of the toe to flex it and is innervated by the lateral plantar nerve.
