What is the definition or description of: spinal disc?

Spine shock absorber: Spinal discs are located between the vertebrae (blocks of bone) of the spine (expect the upper 2). They act like shock absorbers and are also important in allowing our spines to be flexible. They have a tough outer rim made of strong fibers and a fleshier shock-absorbing tissue in the center. These "shocks" can wear out with routine life activities, age and injuries. They can also press on nerves.