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A disc is the shock absorber of the spine
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It lies between the two adjacent bones called vertebral bodies
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The nerves descend behind the vertebrae and discs
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The back of the disc is in close proximity to the nerves
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At each level the nerves give rise to 2 smaller nerves (one on each side) called nerve roots for their similarities to the roots of a tree
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Several nerve roots on each side will converge and form the major nerves that descend to your legs like the sciatic nerve