Figure Legend: The wrinkle test may be
used to assess sensory nerve function in the unreliable patient.
For a period of months after nerve injury, denervated scan loses its ability
to wrinkle when immersed in water. Here, failure of a small finger
skin to wrinkle when immersed in water for ten minutes (compared to normal
adjacent ring finger) strongly suggests injury of both digital nerves of
the small finger.