Science today isn't the same as the science 2000 years ago was but some principles remain the same. The human knowledge constantly grows but with more knowledge there comes even more mysteries and unsolved questions, so science is always going forward.
Causes. The most common cause of a cervical herniated nucleus pulposus is gradual degeneration of the disc, attenuation (weakening) of the posterior annulus fibrosis, and subsequent protrusion of the nucleus pulposus into the spinal canal causing compression of the nerve root.
The discâs nucleus serves as the main shock absorber for the adjacent vertebrae. When a tear occurs in the outer (annular) ring of the disc, the soft nucleus pulposus can protrude into the spinal canal. This common and painful disorder is called a herniated disc (also known as a ruptured disc or a prolapsed disc). The protrusion of the nucleus pulposus can press on a nerve root or the spinal cord. The damaged disc can also leak fluid, which may inflame nerve roots. For this reason, herniated discs can become extremely painful. When a herniated disc occurs in the mid back it can be extremely serious.