The spine is formed by 33 interlocking bones called vertebrae. Located between each pair of vertebrae is a disc. The disc is composed of a capsule of connective tissue surrounding a soft, jellylike center. These discs absorb shock and provide flexibility within the spine.
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| Primary Medical Reviewer | William M. Green, MD - Emergency Medicine |
| Specialist Medical Reviewer | Robert B. Keller, MD - Orthopedics |