A spider crawls on your leg., The body feels a sensation on the skin., The sensory neurons pass along the signal...ZAP!, The signal passes from sensory neurons to interneurons...ZAP!, The interneurons pass a signal through the spinal cord to the brain...ZAP!, The brain recognizes that the sensation is a spider., The brain sends a signal with the motor neurons., The motor neurons pass the signal back to the muscles., The muscles respond!.

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