The structure you are referring to is likely the coronary sinus. It is a collection of veins that drain deoxygenated blood from the heart muscle itself back into the right atrium of the heart. It serves as the main venous drainage for the heart.
coronary sinus
coronary sinus. It is a vein located on the heart's surface that collects deoxygenated blood from the coronary circulation and returns it to the right atrium.
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.
coronary arteries and coronary veins
coronary arteries and coronary veins
coronary atherosclerosis of native coronary vessel
angioplasty
A coronary stent is an artificial support device placed in the coronary artery to keep the vessel open after treatment for coronary artery disease.
Just outside the Left ventricle, in the aortic cusp.
The myocardium or heart muscle is nourished with oxygen-rich blood. The vessel that delivers the blood to the myocardium is called Coronary Arteries.
A coronary stent is an artificial support device placed in the coronary artery to keep the vessel open after treatment for coronary artery disease.