Pain insensitive structure in the spine – Physiology MCQ

Which of the following structure in the spine is pain insensitive?
A. Nucleus pulposus
B. Dura
C. Annulus fibrosus
D. Longitudinal ligaments

Correct answer: A. Nucleus pulposus

Explanation:

Pain sensitive structures of the spine are:

Facet joints
Periosteum of vertebrae
Annulus fibrosus of intervertebral disc
Dura
Epidural veins and arteries
Longitudinal ligaments

Nucleus pulposus of intervertebral disk is not pain sensitive.

Reference: Harrison’s Principles of Internal Medicine, 19th edition, p111

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