Some people have small sensory nerves that get trapped in scar tissue, and may experience prolonged periods of pain, he said.

CNN: Scalp burns painful, need urgent care

Several patients underwent surgery to reroute their motor nerves to different muscles, but in the process the sensory nerves reinnervated themselves too, attaching themselves to the skin receptors.

ECONOMIST: Rewiring nerves

By rewiring a missing arm's motor nerves to muscles in the remaining stump, shoulder or chest, for example, and rewiring the arm's sensory nerves to the skin in these regions, a channel is opened to the part of the brain that once controlled the missing limb.

ECONOMIST: Rewiring nerves

The sensory side of things works in a similar fashion, but instead of reconnecting nerves to different muscles, they are instead rewired to the skin's underlying sensory systems.

ECONOMIST: Rewiring nerves

Experts disagree about how a migraine is triggered, but the trigeminal nerve an important pathway that carries sensory information about the face and its connections to numerous other nerves and the brain appear to be responsible for transmitting the pain.

WSJ: Fresh Target in Hunt for a Migraine Cure