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Animal Chiropractic Module 1 Practice Exam

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Which part of the intervertebral disk is the central soft portion that is the main shock absorber and lacks nerves and blood supply?
Correct Answer:
Nucleus pulposus
Explanation:
The central soft portion is the nucleus pulposus. Its gelatinous, water-rich composition lets it evenly distribute compressive loads, making it the main shock absorber between vertebrae. In adults, it lacks nerves and blood vessels, so it receives nutrients by diffusion from the adjacent vertebral endplates rather than through blood vessels. The surrounding annulus fibrosus forms the tough outer ring that contains the nucleus and provides tensile strength; its outer layers have nerve endings, which is why injury there can be painful. The other two structures are ligaments, not parts of the disk’s central portion.

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