The coronary sinus is a collection of veins, which connect to a large vessel that collects blood from the myocardium. It provides less oxygenated blood to the right atrium, as well as better and weaker veins. It occurs in all mammals, including humans.


The name comes from the Latin crown, which means the crown because this vessel forms a partial circle around the heart. The coronary sinus drains into the right atrium. The mouth of the coronary sinus, the opening between the inferior vena cava and the right atrioventricular or tricuspid valve.


It draws blood from the heart muscle and is protected by a semicircular fold of the lining of the ear mucus, the coronary sinus valve (or Thebesius valve).



coronary sinus function

The coronary sinus receives blood mainly from small, medium, large and oblique cardiac veins. He also receives blood from the left marginal vein and left vena cava of the ventricle. He drains into the right atrium.


coronary sinus function


In the coronary sinus function, the front veins of the heart do not flow down to the coronary sinus but flow directly into the right atrium. Some small veins, known as the smallest cardiac veins, flow directly to each of the four chambers of the heart.


The coronary sinus begins with the intersection of the great cardiac vein and oblique vein of the left atrium. The end of the great cardiac vein and coronary sinus mark with a Vieussens valve.


The coronary sinus function runs transversely in the left atrioventricular groove on the back of the heart. It is the distal part of the great cardiac vein supplying the right atrium.


The valve of the coronary sinus is located on the posterior. The inferior surface of the heart, medially to the lower opening of the vena cava. It is slightly higher than the partition of the tricuspid valve. The coronary sinus valve is also known as Thebes’ valve.