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Answer :
Final answer:
The posterior anulus fibrosus is considered a secondary factor in the spinal degenerative cycle, with increased risk of herniated discs due to age or injury. Spinal curvature and shearing forces also play a role in disc degeneration and injury, particularly in the lumbosacral region.
Explanation:
The disc is considered a primary factor in the onset of the degenerative cycle of the spine, particularly due to changes in the nucleus pulposus causing discs to become thinner and lose flexibility with age. A secondary factor in this degenerative process involves the posterior structures, especially the posterior anulus fibrosus.
This structure can be weakened due to injury or age, leading to the risk of a herniated disc when subjected to pressure during activities like bending forward and lifting heavy objects. The posterior bulge can compress a spinal nerve and cause symptoms like pain or muscle weakness in the areas supplied by the affected nerve.
Moreover, the overall spinal column has normal curvatures for stability which, when increased, lead to shearing forces on the lower vertebrae, thus increasing the risk of injuries like ruptured discs. Notably, the lumbosacral disc is at higher risk due to its position. Overall, degenerative changes and injuries to these spinal structures are highly significant considering the intricate network of muscles, joints, and discs which all play a role in maintaining back health.
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