What are the two parts of the intervertebral disc?

• A. Annulus fibrosus and nucleus pulposus
• B. Annulus pulposus and nucleus fibrosus
• C. Annulus fibrosus and annulus pulposus
• D. Nucleus pulposus and vertebral arch

Answer: (A)

The intervertebral disc is made up of two distinct parts: the annulus fibrosus and the nucleus pulposus. The annulus fibrosus is the outer layer of the disc, consisting of concentric rings of tough fibrocartilage that provide strength and structural integrity. This outer layer helps to contain the inner gel-like substance, which is the nucleus pulposus. The nucleus pulposus acts as a shock absorber, allowing the disc to withstand compression and provide flexibility to the spinal column.

This understanding of the structure of intervertebral discs is important in radiography as it helps radiologic technologists recognize and identify normal anatomy in imaging studies, as well as to be aware of common pathologies such as herniated discs, which can involve displacement or degeneration of these components.