The Annulus Fibrosus is the tough, outer layer of an intervertebral disc in the spine. It consists of several concentric rings of collagen fibers that provide strength and stability to the disc. This structure helps to contain the inner gel-like substance, known as the Nucleus Pulposus, which acts as a cushion between the vertebrae. The primary function of the Annulus Fibrosus is to absorb shock and distribute pressure during movement. It plays a crucial role in maintaining the integrity of the spine, allowing for flexibility while preventing excessive movement that could lead to injury or conditions such as herniated discs.