ANNULUS FIBROSUS DISCI INTERVERTEBRALIS

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

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Spelling notes

Either "''anulus''" or "''annulus''" are correct spellings. Gray's Anatomy uses "''annulus fibrosus''," Terminologia Anatomica uses "''anulus fibrosus''," and Nomina Anatomica uses both forms. A Google search indicates that "''annulus fibrosus''" is the most common usage.
"''Fibrosus''" has no correct alternative spelling; "''fibrosis''" has a different meaning and is incorrect in this context. ''See: AJNR''

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★ Diagram at upenn.edu

★ Diagram at spineuniverse.com