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Among other things, these nerves give power to the muscles and give sensation to the skin. It is through the spinal nerves that you can direct movement and feel temperature, pressure, and pain. These sensations are not just normal parts of life; they also provide a natural alarm system: they warn you that a bodily structure is about to sustain some damage or has already been damaged.
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Robin McKenzie (7 Steps to a Pain-Free Life: How to Rapidly Relieve Back and Neck Pain)