Cutaneous innervation of the higher limb The hand is innervated with the radial, median, and ulnar nerves. The radial nerve materials the finger extensors as well as thumb abductor, So the muscles that extends for the wrist and metacarpophalangeal joints (knuckles); and that abducts and extends the thumb. The thumb https://adspostfree.com/ads/hand-crafted-metalworks/