Annulus fibrosus disci intervertebralis

Annulus fibrosus disci intervertebralis
Cervical vertebra with intervertebral disc. (Disc annulus labeled at bottom right, and is visible at center in blue.)
Stages of Spinal Disc Herniation
Gray's	subject #72 289

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

Spelling notes

Both "anulus" and "annulus" are acceptable spellings. Gray's Anatomy uses "annulus fibrosus," Terminologia Anatomica uses "anulus fibrosus," and Nomina Anatomica uses both forms. Etymologically speaking, anulus seems to be the correct spelling as it is the diminutive of L. anus, a ring, hence anulus, a little ring.

"Fibrosus" has no correct alternative spelling; "fibrosis" has a different meaning and is incorrect in this context. ^[1]

References

1. ^ Fardon DF (2001). "Nomenclature and classification of lumbar disc pathology". Spine 26 (5): 461–2. doi:10.1097/00007632-200103010-00007. PMID 11242371. http://www.asnr.org/spine_nomenclature/. 

External links

• Duke Orthopedics annulus_fibrosus
• anulus+fibrosus+of+intervertebral+disc at eMedicine Dictionary
• Diagram at upenn.edu
• Diagram at spineuniverse.com

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.