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Byline: Claudia Kalb, With Karen Springen, Anne Underwood, Mary Carmichael and Ellise Pierce
Stop rubbing your sore back for a minute and take a quick tour of Mother Nature's engineering masterpiece: the human spine. Pretend you are Alice, so tiny you can climb among the muscles, nerves, bones and ligaments that make up the very core of your body. Crawl down the 24 vertebrae that encase and protect the spinal cord, from the cervical spine to the thoracic area to the lumbar region, that pesky lower back. Note the 23 rubbery white discs: the cartilage inner tubes that cushion the vertebrae. Observe the dozens of spinal nerves threading out from the cord between the ...