If you've ever bumped your elbow and felt a tingling sensation down your arm into your hand (hitting your "funny bone"), you've bumped the ulnar nerve. But the ulnar nerve also can be the cause of more serious and permanent problems in the fingers and hand.
The ulnar nerve extends down the arm, across the elbow, and into the hand. It provides sensation to the little and ring fingers and activates many of the small muscles in the hand. (Full story)