Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
b. A vertebral disc is composed of an inner anulus fibrosus and an outer nucleus pulposus.
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7. The Skeletal System
The Spine
2:26 minutesProblem 8
Textbook Question
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 guidance1
The intervertebral disc is composed of two main regions: the anulus fibrosus and the nucleus pulposus. Begin by understanding their structure and function. The anulus fibrosus is the outer layer, made of concentric rings of collagen fibers, providing durability and strength. The nucleus pulposus is the inner gel-like core, rich in proteoglycans, which provides resilience and shock absorption.
To determine which part provides durability and strength, focus on the anulus fibrosus. Its dense collagen fibers resist tensile forces and maintain the disc's structural integrity during movement.
To identify which part provides resilience, examine the nucleus pulposus. Its gel-like consistency allows it to absorb compressive forces and distribute pressure evenly across the disc during activities like walking or jumping.
Understand the concept of a 'slipped' disc (herniated disc). This occurs when the nucleus pulposus protrudes through a weakened or torn area of the anulus fibrosus, often compressing nearby nerves and causing pain or discomfort.
Summarize the roles: the anulus fibrosus provides durability and strength, while the nucleus pulposus provides resilience. A 'slipped' disc involves the nucleus pulposus escaping through the anulus fibrosus due to damage or degeneration.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Anulus Fibrosus
The anulus fibrosus is the outer ring of the intervertebral disc, composed of several layers of collagen fibers arranged in a concentric pattern. This structure provides durability and strength to the disc, allowing it to withstand axial loads and torsional forces. Its tough composition helps maintain the integrity of the disc and prevents excessive movement between vertebrae.
Nucleus Pulposus
The nucleus pulposus is the gel-like center of the intervertebral disc, primarily made up of water and a loose network of collagen fibers. This region provides resilience and acts as a shock absorber, allowing the disc to deform under pressure and return to its original shape. Its unique composition is crucial for maintaining flexibility and cushioning the spine during movement.
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Nucleus
Slipped Disc
A 'slipped' disc, also known as a herniated disc, occurs when the nucleus pulposus protrudes through a tear in the anulus fibrosus. This condition can lead to nerve compression, causing pain, numbness, or weakness in the limbs. The nucleus pulposus is primarily involved in this process, as its displacement disrupts the structural integrity of the disc and affects surrounding tissues.
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