Intervertebral discs contribute to spinal mobility by cushioning and allowing movement. What happens in a herniated disc?

• A. Discs cushion and allow movement; nucleus pulposus protrudes through annulus fibrosus, compressing adjacent nerves and causing pain.
• B. Discs produce synovial fluid to lubricate joints.
• C. Discs are the primary site of hematopoiesis.
• D. Discs store calcium in the vertebrae.

Answer: (A)