Info

4.9 days

MEDICAL: Back Problems 214

6.5 days

SURGICAL: Back and Neck Procedures with CC

The intervertebral disk is a complex structure that is situated between vertebrae; it provides additional structural support to the spinal column and cushions the vertebrae. The outer layer of the disk contains numerous concentric rings of tough, fibrous connective tissue called the annu-lus fibrosus. The central portion of the disk consists of a softer, spongier material called the nucleus pulposus. If the annulus fibrosus weakens or tears, then the nucleus pulposus may "slip" or herniate outward, creating the condition known as a "slipped disk," or, more precisely, herni-ated nucleus pulposus. When the disk material herniates, it can compress the spinal cord or the nerve roots that come from the spinal cord. Of herniations, 90% usually occur in the lumbar and lumbosacral regions, 8% occur in the cervical area, and 1% to 2% occur in the thoracic area. The disk between the fifth and the sixth cervical vertebrae is involved most frequently.

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