Anulus fibrosus

Definition

The anulus fibrosus is a tough, circular ring of fibrocartilage that forms the outer layer of an intervertebral disc, providing structure and strength to the disc while allowing for flexibility and movement in the vertebral column. It encases a softer, gel-like center called the nucleus pulposus, working together to absorb shock and prevent spinal vertebrae from grinding against each other.

Related terms

Nucleus Pulposus:

A gel-like substance in the center of an intervertebral disc that helps absorb shock and maintain flexibility within the spine.

Intervertebral Disc: A cartilaginous pad located between adjacent vertebrae in the spine, composed of the anulus fibrosus and nucleus pulposus, that helps facilitate movement and serve as a ligament to hold vertebrae together.

Vertebral Column:

The part of the axial skeleton that consists of 33 vertebrae in humans; it houses and protects the spinal cord while providing structural support and facilitating movement