Definitions for "ANNULUS FIBROSIS"
The highly elastic fibrocarti laginous envelope about each intervertebral disk. A tear of this membrane and dislodging of the inner cartilage leads to extrusion of the nucleus pulposus of the disk.
This is the peripheral portion of the intervertebral disc, consisting of collagen fibres arranged in a highly ordered pattern. The posterior fibres of the collagen lamellae are thinner and more tightly packed, hence the posterior aspect of the annulus fibrosis is thinner than the rest of the annulus.
Tough fibrous outer casting of the intervertebral disc that holds the nucleus pulposus in place.