Right fibrous ring

The right fibrous ring of the heart is the fibrous portion of the tricuspid valve annulus, forming part of the heart’s central fibrous skeleton and providing structural and electrical functions at the right AV junction.

The right fibrous ring specifically supports the tricuspid valve orifice and is less robust than the left (mitral) fibrous ring, with true fibrous tissue present mainly where the tricuspid leaflets attach to the central fibrous body. This central fibrous body is a key part of the fibrous skeleton, connecting the right and left fibrous trigones and providing continuity between the aortic, mitral, and tricuspid valves.

The fibrous skeleton, including the right fibrous ring, is essential for maintaining the integrity of the valvular orifices and for insulating the atria from the ventricles electrically, except at the site of the AV node and His bundle.