What are the three tributaries of the coronary sinus?

The coronary sinus is a collection of veins that together
form one large vessel to collect blood from the myocardium of the heart.  The right
atrium receives deoxygenated blood from coronary sinus.

The
tributaries of the coronary sinus are: the left marginal vein, the left posterior
ventricular vein, and the cardiac veins (small, middle, great, and
oblique).

The left marginal vein receives its blood from
the left atrium, and both ventricles.  The left poster ventricular vein runs along the
diaphragmatic surface of the left ventricle receiving its blood from the left atrium as
well.  The cardiac veins also receive their blood from the left atrium and both
ventricles, their names referring to their locations: great (begins at the apex of the
heart and goes along the anterior longitudinal sulcus), small (runs along the coronary
sculls), middle (starts at the apex of the heart and runs along the posterior
longitudinal sulcus), and oblique (descends obliquely on the back of the left
atrium).