opponens digiti minimi muscle of hand opponens digiti minimi muscle of hand the opponens digiti minimi (opponens digiti quinti in older texts) is a muscle in the hand. it is of a triangular form, and placed immediately beneath the palmaris brevis, abductor digiti minimi and flexor digiti minimi brevis. it is one of the three hypothenar muscles that control the little finger. opponens digiti minimi muscledeep muscles of the right hand, palmar view.detailsoriginhook of hamate and flexor retinaculuminsertionmedial border of 5th metacarpal (in hand, 3rd digit is orientation of mid-line)arteryulnar arterynervedeep branch of ulnar nerve (c8 and t1)actionsdraws 5th metacarpal anteriorly and rotates it, bringing little finger (5th digit) into opposition with thumbidentifierslatinmusculus opponens digiti minimi(old: opponens quinti digiti)ta98a04.6.02.064ta22531fma37384anatomical terms of muscle it arises from the convexity of the hamulus of the hamate bone and the contiguous portion of the transverse carpal ligament; it is inserted into the whole length of the metacarpal bone of the little finger, along its ulnar margin. the opponens digiti minimi muscle serves to flex and laterally rotate the 5th metacarpal about the 5th carpometacarpal joint, as when bringing the little finger and thumb into opposition. it is innervated by the deep branch of the ulnar nerve.