![]() ![]() The net result is the extensor digiti minimi remains unopposed, with the abduction positioning favored. There is also attenuated function of the abductor digiti minimi (also ulnar nerve), but the effect of loss of adduction function of palmar interossei is more significant in pinky position. ![]() ![]() Wartenberg sign → ulnar nerve palsy resulting in attenuated function of palmar interossei → loss of pinky adduction component → pinky’s normal position is more abducted.Note that the pinky is adducted by the palmar interossei, but it is not abducted by the dorsal interossei the abductor digiti minimi abducts the pinky.Adduct the pinky, ring, middle, and index fingers (i.e., the pinky, ring, and index movement toward from the middle finger.Movement of the middle finger medially is referred to as ulnar abduction movement of the middle finger laterally is referred to as radial abduction. Should be noted that the middle finger has two dorsal interossei attachments and no palmar interossei attachments.PAD DAB– mnemonic for memorizing actions of dorsal vs palmar interosseous functions – Palmar ADduction, Dorsal ABduction.Innervated by deep branch of ulnar nerve.Insert on the proximal phalanges and extensor expansions (specialized connective tissue).Abduct the ring, middle, and index fingers (i.e., the ring and index movement away from the middle finger + the middle finger movement radially).Innervated by the deep branch of ulnar nerve.Enables grasping of large objects while the fingers are outstretched.Abducts the pinky at the 5th carpometacarpal joint. ![]()
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