Annulus fibrosus or anulus fibrosus may refer to:

• Annulus fibrosus cordis — fibrous ring of heart
• Annulus fibrosus disci intervertebralis — fibrous ring of intervertebral disk

The right and left fibrous rings of heart ( anulus fibrosus cordis) surround the Atrioventricular and arterial orifices and are stronger upon the left than on the Each Intervertebral fibrocartilage is composed at its circumference of laminæ of fibrous tissue and Fibrocartilage, forming the annulus fibrosus.

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