Herniated and Bulging Discs are some of the most common causes of pain and discomfort in the back that Chiropractors see in their patients. Backbone discs are sensitive because they are like spongy pads found between the particular bone fragments, the vertebrae, of the spinal column. Generally known as intervertebral discs, each is a set, circular capsule about one inch in diameter and one-quarter inches thick. Each intervertebral disc has a biscuit-shaped framework with a jelly-like middle known as the Nucleus Pulposus and an extremely strong external membrane known as the Annulus Fibrous. As children, the spinal discs are fluid-filled sacs that start to solidify as part of the regular aging. By beginning adulthood, the blood supply stops and the soft inner material hardens. By middle age, your discs are hard, almost like a piece of hard rubber. This is why adults are vulnerable to disc damage and Disc Degeneration.