A member asked:

Could you tell me the difference between annulus fibrosus and nucleus pulposus in intervertebral disc?

A doctor has provided 1 answer

Shell vs jelly: Annulus is the rings of connective tissue, like cartilage, that form the outer part of the disk. Nucleus pulposis is the jelly filling. A herniated disc occurs when the jelly squirts out of the shell whereas a "protrusion" occurs when a part of the annulus is pooching out.

Answered 4/14/2014

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