The ulnar nerves are a set of nerves that run from the spinal cord to the hand and wrist, supplying sensation and muscle control to this area. Synonyms for ulnar nerves include the ulnar nerve bundle and the ulnar digital nerves. These nerves are an essential part of the peripheral nervous system and help to control muscle movement and sensation in the hand, including the little finger and half of the ring finger. Damage to the ulnar nerves can cause symptoms such as numbness, tingling, weakness, and loss of muscle control, so they are critical for everyday activities like typing, gripping, and holding objects.