<P> In human anatomy , the ulnar nerve is a nerve that runs near the ulna bone . The ulnar collateral ligament of elbow joint is in relation with the ulnar nerve . The nerve is the largest unprotected nerve in the human body ( meaning unprotected by muscle or bone ) , so injury is common . This nerve is directly connected to the little finger , and the adjacent half of the ring finger , innervating the palmar aspect of these fingers , including both front and back of the tips , perhaps as far back as the fingernail beds . </P>
striking the funny bone is actually compression of the
ulnar nerve