Distinguish between the anulus fibrosus and nucleus pulposus regions of a disc. Which provides durability and strength? Which provides resilience? Which part is involved in a 'slipped' disc?

Verified step by step guidance

1. Identify the two main components of an intervertebral disc: the anulus fibrosus and the nucleus pulposus.
2. Describe the anulus fibrosus: it is the tough, outer layer of the disc composed of concentric layers of collagen fibers. This structure provides durability and strength to the disc.
3. Describe the nucleus pulposus: it is the gel-like, inner core of the disc that provides resilience and the ability to absorb shock.
4. Determine which part is involved in a 'slipped' disc: a 'slipped' or herniated disc occurs when the nucleus pulposus protrudes through a tear in the anulus fibrosus.
5. Summarize the roles: the anulus fibrosus provides structural integrity and strength, while the nucleus pulposus provides cushioning and flexibility.

Key Concepts

Anulus Fibrosus

The anulus fibrosus is the outer ring of the intervertebral disc, composed of several layers of collagen fibers. This structure provides durability and strength to the disc, allowing it to withstand axial loads and torsional forces. Its fibrous nature helps maintain the integrity of the disc, preventing excessive movement between vertebrae.

Nucleus Pulposus

The nucleus pulposus is the gel-like core of the intervertebral disc, primarily made up of water and a network of collagen and proteoglycans. This region provides resilience and shock absorption, allowing the disc to adapt to compressive forces and maintain flexibility. It plays a crucial role in distributing loads across the vertebral bodies during movement.

Slipped Disc

A 'slipped' disc, or herniated disc, occurs when the nucleus pulposus protrudes through a tear in the anulus fibrosus. This condition can lead to nerve compression, causing pain and discomfort. The nucleus pulposus is primarily involved in this process, as its displacement disrupts the structural integrity of the disc and affects surrounding tissues.