About the veins of the heart, which of the following descriptions are correct?
选项：

A:The coronary sinus opens into the right atrium through the orifice of coronary sinus.
B:The great cardiac vein enters the right end of the coronary sinus.
C:The middle cardiac vein accompanies the posterior interventricular branch.
D:The small cardiac vein enters the left end of the coronary sinus.
E:The anterior cardiac veins open directly into the right atrium.