I found this explanation which seems easy to understand.
Quote:
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....Put simply, sensory nerves send impulses about what is happening in our environment to the brain via the spinal cord. The brain sends information back to the motor nerves, which help us perform actions. It’s like having a very complicated in and out box for everything...
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There's more here at this website:
http://pain.about.com/od/whatischron...eling_pain.htm
I hope that helps.
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