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.
Discussion. An important, frequently difficult to diagnose, type of disc herniation is a free disc fragment or sequestered disc herniation. A sequestered disc herniation occurs when extruded disc material is no longer contiguous with the parent nucleus pulposus.iscussion. An important, frequently difficult to diagnose, type of disc herniation is a free disc fragment or sequestered disc herniation. A sequestered disc herniation occurs when extruded disc material is no longer contiguous with the parent nucleus pulposus.