Which of the following structure in the spine is pain insensitive?
A. Nucleus pulposus
C. Annulus fibrosus
D. Longitudinal ligaments
Correct answer: A. Nucleus pulposus
Pain sensitive structures of the spine are:
- Facet joints
- Periosteum of vertebrae
- Annulus fibrosus of intervertebral disc
- 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