What's the disc got to do with it?

Spinal discs are explained here as force-distributing structures made of a hydrated nucleus pulposus in the center and the annulus fibrosus around it. Learners are shown how a healthy disc manages compression by spreading load outward, much like a water balloon inside a tire, and how hydration changes with age. The main focus is how bending affects the disc and why this can make the annulus more vulnerable. Forward flexion increases pressure within the disc and can contribute to radial fissures, where nuclear material gradually tracks through the annulus and may eventually form a herniation. The explanation also clarifies that herniated material is not always pure nucleus pulposus; it may include annulus, end plate, or bone fragments. The discussion then connects disc herniation to radicular pain, especially in younger people, while also noting that herniations often resorb over time through immune activity and may become less clinically important even if they remain visible on MRI. Stenosis, nerve compression, oxygen deprivation, and other less common causes of symptoms are also outlined.