The flexor digiti minimi brevis muscle is lateral to the abductor digiti minimi (Fig. 7.107). It originates from the hook of the hamate bone and the adjacent flexor retinaculum and inserts with the abductor digiti minimi muscle into the medial side of the base of the proximal phalanx of the little finger.
The flexor digiti minimi brevis flexes the metacarpophalangeal joint.