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Spine

The spine (backbone) is composed of 33 interlocking bones called vertebrae that are separated by soft, compressible discs and supported by many different ligaments and muscles. It is divided into five segments: cervical (neck), thoracic (upper and middle back), lumbar (lower back), sacrum (pelvis), and coccyx (tailbone). In each segment, the vertebrae are numbered from top to bottom. For example, a C3 is the third vertebra in the neck area, while a T6 is the sixth vertebra in the thoracic area.

The vertebrae in the spine normally form 3 curves. These curves allow the spine to absorb shock as you move.

By Healthwise Staff
Primary Medical Reviewer William M. Green, MD - Emergency Medicine
Specialist Medical Reviewer Robert B. Keller, MD - Orthopedics
Last Revised February 3, 2010

WebMD Medical Reference from Healthwise

Last Updated: February 03, 2010
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
© 1995-2011 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.

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