Coronary circulation is the heart's own blood supply, via right and left coronary arteries arising from the aortic root behind the valve cusps.
Normal coronary blood flow is about 250 ml/min (84 ml/100 g cardiac tissue/min), about 4.7% of cardiac output.
Arterial Supply and Venous Drainage
RCA supplies the right atrium and right ventricle.
LCA supplies the left atrium and left ventricle.
No anastomoses exist between them, so coronary arteries are end arteries with non-overlapping territories.
Sinuses of Valsalva (outpouches of the aorta behind the semilunar cusps) generate eddy currents that keep the valve cusps away from the coronary ostia in systole, allowing coronary filling.
Venous drainage
Major: coronary sinus and anterior cardiac veins, into the right atrium.
Minor: arteriosinusoidal, thebesian and arterioluminal vessels, draining directly into cardiac chambers.