Editing Vieussens valve of the coronary sinus (section)

=== Anatomy ===

The coronary sinus is a large vein located in the posterior part of the heart. It collects deoxygenated blood from the cardiac veins and returns it to the right atrium. The Vieussens valve is situated at the junction of the coronary sinus and the right atrium.

The valve consists of a thin, membranous fold of tissue that forms a one-way flap. It is composed of connective tissue and smooth muscle fibers. The valve is attached to the walls of the coronary sinus and prevents the backflow of blood from the right atrium into the coronary sinus.