Skip to main content

Unfortunately we don't fully support your browser. If you have the option to, please upgrade to a newer version or use Mozilla Firefox, Microsoft Edge, Google Chrome, or Safari 14 or newer. If you are unable to, and need support, please send us your feedback.

Publish with us
Anulus Fibrosus (L3-L4)
Connective Tissue

Anulus Fibrosus (L3-L4)

Anulus fibrosus

Read more

Anatomical Relations

The anulus fibrosus is the outer component of the intervertebral disc. However, the anulus fibrosis is thinner posteriorly. They insert into the epiphyseal rim on the outer perimeter of the vertebral bodies.

Complete Anatomy
The world's most advanced 3D anatomy platform
Try it for Free


The anulus fibrosus aids in the structural integrity of the vertebral column. The oblique arrangement of adjacent layers of fibers limits rotation and aids in the strength (Standring, 2016).


It is composed of an outer lamella of collagen fibers and inner lamellae of fibrocartilaginous tissue. The fibers of adjacent lamellae are arranged obliquely in opposite directions.


Standring, S. (2016) Gray's Anatomy: The Anatomical Basis of Clinical Practice. Gray's Anatomy Series 41st edn.: Elsevier Limited.

Learn more about this topic from other Elsevier products

Annulus Fibrosus

ScienceDirect image

Damage to the AF that occurs in progressive disc degeneration or after surgical discectomy causes a gradual loss in disc height, leading to changes in the biomechanical characteristics of the remaining disc.

Explore on ScienceDirect(opens in new tab/window)

Complete Anatomy

The world's most advanced 3D anatomy platform

Complete Anatomy