The nucleus pulposus is defined as?

• A. Bone in the back
• B. Cartilage near part of the disc
• C. Gelatinous like substance in the disc
• D. Ligament between the disc

Answer: (C)

The nucleus pulposus refers to the inner portion of the intervertebral disc, which is comprised of a gelatinous-like substance. This structure serves a critical role in the spine, providing it with flexibility and shock absorption. The composition of the nucleus pulposus is rich in water and collagen fibers, allowing it to withstand pressure and contribute to the overall function of the disc in maintaining the proper alignment and movement of the spine. It acts as a cushion between the vertebrae, facilitating load distribution and supporting spinal mechanics during various activities.

The other options presented do not accurately describe the nucleus pulposus. Bone in the back pertains to the vertebrae rather than the disc itself. Cartilage near part of the disc could refer to the annulus fibrosus, which surrounds the nucleus pulposus and provides additional support but is distinctly different from the nucleus itself. A ligament between the disc is also not relevant, as ligaments serve to connect bones to other bones rather than being part of the disk structure.