About the veins of the heart, which of the following descriptions are correct?
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.正确答案ACE
