The coronary sinus returns blood to which part of the heart?

The coronary sinus is a large vein that collects deoxygenated blood from the heart muscle (myocardium). It primarily receives blood from the cardiac veins, which drain the myocardium, and it is responsible for returning this blood to the right atrium of the heart.

Once the blood is collected by the coronary sinus, it flows directly into the right atrium, where it can then be sent to the right ventricle and subsequently to the lungs for oxygenation. This process is critical in maintaining the heart’s function, as it allows for the efficient circulation of blood.

This anatomical feature is vital to understand, as it plays a significant role in the overall circulation system within the heart.