This site is intended for healthcare professionals

Go to /sign-in page

You can view 5 more pages before signing in

Mitral valve annulus (anatomy)

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

The mitral valve annulus is part of the fibrous skeleton of the heart. It consists of a ring of collagenous tissue that surrounds and supports the left atrioventricular orifice. It forms the attachment of the mitral valve leaflets by fusion with their intermediate layer, the lamina fibrosa.

The annulus is not uniformly thick throughout its circumference:

  • to the right, it is attached to the right and left fibrous trigones of the fibrous skeleton
  • between the trigones, the space is bridged by an extension of the lamina fibrosa of the anterior valve leaflet inferiorly to merge with the fibrous subaortic curtain
  • long subendocardial fibrous thickenings pass from each trigone around the annulus - the fila coronaria; with distance laterally, they taper in thickness
  • the space between the ends of the fila coronaria is bridged by a thin layer of fibrous tissue

The structure of the annulus contributes to the dynamics of mitral valve opening.


Create an account to add page annotations

Annotations allow you to add information to this page that would be handy to have on hand during a consultation. E.g. a website or number. This information will always show when you visit this page.

The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

Connect

Copyright 2024 Oxbridge Solutions Limited, a subsidiary of OmniaMed Communications Limited. All rights reserved. Any distribution or duplication of the information contained herein is strictly prohibited. Oxbridge Solutions receives funding from advertising but maintains editorial independence.