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The left fibrous ring, similar to the right fibrous ring, surrounds the orifice of the bicuspid or mitral valve. It is a thickened area of connective tissue that provides an attachment for the valve flaps and for the muscle fibres of the ventricles and atria.
The right fibrous ring is a part of the fibrous cardiac skeleton. It is a thickened area of connective tissue surrounding the tricuspid valve’s orifice. It provides an attachment site for the valve flaps and for the muscle fibres of the ventricles and atria
The fibrous skeleton is a structure made of connective tissue that gives attachment to the heart’s valves and myocardium. It is connected to the muscle of the heart in a manner analogous to the attachment of tendon to skeletal muscle. The structure that supports the Atrioventricular valves are ring-shaped, while the annulus of the aortic valve is crown-shaped.
The membranous septum is primarily composed of fibrous tissue and represents the thin part of the interventricular septum.
The muscular part of interventricular septum is the thick muscular part of the interventricular septum.