Annulus fibrosus


Each intervertebral fibrocartilage is composed, at its circumference, of laminæ of fibrous tissue and fibrocartilage, forming the annulus fibrosus.

Type I collagen accounts for nearly 70% of the dry weight of the outer annulus fibrosus (AF), with type II collagen gradually increasing and type I collagen decreasing from the outer to inner AF 1).

Each layer of the AF has an oriented collagen architecture, with adjacent lamellae alternating in fiber angles approximately 30° to the transverse plane of the disc 2).

see Annulus fibrosus repair.

Oegema TR Jr. Biochemistry of the intervertebral disc. Clin Sports Med. 1993 Jul;12(3):419-39. Review. PubMed PMID: 8364983.
Cassidy JJ, Hiltner A, Baer E. Hierarchical structure of the intervertebral disc. Connect Tissue Res. 1989;23(1):75-88. PubMed PMID: 2632144.
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