Annulus fibrosus
Annulus fibrosus
Annulus fibrosus (pronunciation: /ˈæn.jʊ.ləs faɪˈbroʊ.səs/) is a crucial component of the intervertebral disc that encircles and protects the nucleus pulposus.
Etymology
The term "annulus fibrosus" is derived from Latin, where "annulus" means ring and "fibrosus" indicates its fibrous nature.
Structure
The annulus fibrosus is composed of several layers, or lamellae, of fibrocartilage. The fibres in each layer run in different directions, which provides strength and flexibility to the disc. The outer layers are primarily made up of type I collagen, while the inner layers contain a mix of type I and type II collagen.
Function
The primary function of the annulus fibrosus is to contain the nucleus pulposus and distribute pressure evenly across the disc. It also acts as a ligament to bind adjacent vertebrae together.
Related Terms
- Intervertebral disc: The disc that separates adjacent vertebrae in the spine.
- Nucleus pulposus: The inner core of the intervertebral disc.
- Collagen: The main structural protein in the extracellular space in the various connective tissues in the body.
- Vertebrae: The individual bones that make up the vertebral column, or spine.
See Also
External links
- Medical encyclopedia article on Annulus fibrosus
- Wikipedia's article - Annulus fibrosus
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