The flexor digiti minimi brevis is a small muscle located in the hand. It is part of the intrinsic muscles that control the movement of the little finger, or digitus minimus. This muscle originates from the hamate bone and the flexor retinaculum, and it inserts into the base of the proximal phalanx of the little finger. Its primary function is to flex the little finger at the metacarpophalangeal joint, allowing for better grip and dexterity. The muscle is innervated by the ulnar nerve, which is responsible for the movement and sensation in the little finger and part of the ring finger.