The heart.
Superior vena cavaInferior vena cavacoronary sinus
Coronary sinus, in turn empties into the right atrium Coronary sinus, in turn empties into the right atrium Coronary sinus, in turn empties into the right atrium Coronary sinus, in turn empties into the right atrium
inferior vena cava superior vena cava coronary sinus
Blood enters the right atrium via three veins: (1) the superior vena cava returns blood from body regions superior to the diaphragm; (2) the inferior vena cava returns blood from the body areas below the diaphragm; and (3) the coronary sinus collects blood draining from the myocardium.
As far as know they are the Coronary Sinus, the Superior Vena Cava and the Inferior Vena Cava.
There are three main openings in the right atrium: the superior vena cava, the inferior vena cava, and the coronary sinus. These openings allow for deoxygenated blood to enter the right atrium from the body and heart itself.
Inferior vena cava(IVC), superior vena cava(SVC) and coronary sinus.
superior and inferior vena cava coronary sinus
Inferior vena cava, superior vena cava and the coronary sinus (which is made of the great cardiac vein)
The coronary sinus is the main vessel that drains oxygen-depleted blood from the myocardium into the right atrium. It collects blood from the cardiac veins that run throughout the heart muscle and then empties into the right atrium of the heart.
Either through the Superior Vena Cava located at the superior aspect of the heart, through the Coronary Sinus located at the inferior aspect of the heart, or through the Inferior Vena Cava located at the inferior aspect of the heart. All of these drain into the right atrium.
The superior vena cava brings deoxygenated blood into the heart, into the right atrium. The superior vena cava is formed by union of the right and left brachiocephalic (innominate) veins.