Annulus - Medical Definition

Annulus

Annulus: A ringlike structure, or any body part that is shaped like a ring. Applied to many small ring-shaped structures. The base of a heart valve that supports the valve's leaflets is called the annulus. A ring-shaped pancreas that encircles the duodenum is an annular pancreas. Annulus is a misspelling of the Latin anulus (a little ring), the diminutive of the Latin anus (a ring of more substantial size).

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