What cardiac vessel located in coronary sulcus in deoxygenated blood?

The cardiac vessel located in the coronary sulcus that primarily contains deoxygenated blood is the coronary sinus. It collects deoxygenated blood from the heart muscle (myocardium) through several cardiac veins and drains into the right atrium. The coronary sulcus, also known as the atrioventricular groove, encircles the heart and separates the atria from the ventricles.