<P> The coronary sinus is a collection of veins joined together to form a large vessel that collects blood from the heart muscle ( myocardium ) . It delivers less - oxygenated blood to the right atrium , as do the superior and inferior vena cavae . It is present in all mammals , including humans . </P>
<P> The coronary sinus is a collection of veins joined together to form a large vessel that collects blood from the heart muscle ( myocardium ) . It delivers less - oxygenated blood to the right atrium , as do the superior and inferior vena cavae . It is present in all mammals , including humans . </P>
the great and small cardiac veins deliver their blood to what vessel
the great and small cardiac veins deliver their blood to what vessel
coronary sinus
coronary sinus