How does your brain know when you feel pain? How does it know the difference between the soft touch of a feather and a needle prick? And, how does that information get to your body in time to respond?

The greater petrosal nerve branches off of the facial nerve in the skull. Along with a chain of other nerves, it innervates (provides nerve function to) the lacrimal gland, which produces tears. The ...

numbness or weakness that radiates along the path of the sciatic nerve, arising from the base of the spine through the hip and buttock and down each leg. Sciatica can be caused anywhere along the ...

1 The Second School of Clinical Medicine, Heilongjiang University of Chinese Medicine, Harbin, China 2 Rehabilitation Center, The Second Affiliated Hospital of Heilongjiang University of Chinese ...