Well, let's go back to a bit of anatomy about discs, specifically lumbar discs, because they are easier to understand. Basically there are 2 parts to a lumbar disc. There is the inner jelly-like part called the nucleus and then there is the tough outer part called the annulus.
The discs in the lumbar or lower back area are described in text books as a shock absorbers. They take the weight of the body because they are located in between the lumbar vertebral bodies, contribute to the height of the spine and are very important for the overall movement of the spine. Because our lifestyles involve a lot of sitting and bending this means the posterior or back section of the annulus can develop fissures or small tears in it.
This then creates an opening for the jelly-like nucleus to move into. Depending on the length of the fissure in the annulus, the nucleus can move a little or a lot. Now the outer 1/3 of a lumbar disc has a nerve supply which ... more.
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