This is why adults are prone to disc injury and degeneration. By middle age, our discs are hard, almost like a piece of hard rubber. By early adulthood, the blood supply stops and the soft inner material hardens. Their main functions are to act as shock absorbers for the spine during movement and to hold the highly pressurized spine center in place.Īs children, the spinal discs are fluid-filled sacs that start to solidify as part of the normal aging process. Discs have tough outer membranes (the annulus fibrous) and elastic cores (the nucleus pulpous). Also called intervertebral discs, each is a flat, circular capsule about an inch in diameter and one-quarter inch thick. Spinal discs are sensitive, spongy pads found between the specialized bones (called the vertebrae) of the spinal column.
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