The coronary veins drains the unoxygenated blood and empty it into the coronary sinus, which empties into the right atrium.
Veins
The myocardium does not have blood flow to the arm. The myocardium is the muscle of the heart and therefore only supplies blood to the heart.
The myocardium receives blood from the coronary arteries.
The Right Coronary Artery supplies blood to the inferior myocardium
The myocardium (middle layer) has the bulk of the muscle which pumps blood from the ventricles.
Oxygenated blood is brought to the myocardium by coronary arteries. These arteries are located all around he surface of the heart.
Unoxygenated
Bicuspid valve
Veins. Veins carry unoxygenated blood towards the heart.
Coronary arteries
coronary
Infarction