What does the Coronary Sinus drain into?

The Coronary Sinus is a large vein situated in the posterior part of the coronary sulcus on the heart's surface. Its primary function is to collect deoxygenated blood from the myocardium (the heart muscle) via various cardiac veins. The draining point of the Coronary Sinus is significant, as it channels this blood directly into the Right Atrium of the heart.

This anatomical pathway is critical for the heart's circulation, as the Right Atrium is involved in receiving deoxygenated blood from the systemic circulation through the superior and inferior vena cavae, as well as from the Coronary Sinus. The blood from the Right Atrium will then flow into the Right Ventricle, and subsequently to the lungs for oxygenation. Understanding this drainage and flow path is crucial for comprehending cardiac function and the overall circulatory system.