The disc is a soft, pulpy "shock absorber." It has a fibrous outer ring which holds in a jelly-like material. A "slipped disc" is a common way to refer to a wide variety of disc problems. However, a disc can't slip, because of the way it attaches to the spinal bones above and blow it. A disc can bulge. It can tear. It can herniate. It can thin. It can dry out. It can collapse. But it cannot slip.
