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The valve of inferior vena cava is the valve found at the intersection of the Inferior Vena Cava and the Right Atrium. It is commonly called the Eustachian valve and has a significant role in the fetal heart. Specifically, it guides the blood flow from the inferior vena cava towards the foramen ovale in the fetus.
The opening of inferior vena cava is where the inferior vena cava drains into the venous component of the right atrium.
The valve of coronary sinus also known as the Thebesian valve, is a semicircular structure situated in the Right Atrium at the entry point of the coronary sinus. Its primary function is to stop the backflow from the Right Atrium to the coronary sinus when the heart contracts.
The opening of coronary sinus is where the coronary sinus drains into the right atrium. It is positioned at its junction with the atrial septum, just above the posterior interventricular groove.
The opening of superior vena cava is where the superior vena cava drains into the venous component of the right atrium.