Anatomy WRONG about venous drainage of hea: A Coronary sinus is guarded by Thebesian valve B Middle cardiac vein lies in posterior atrioventricular groove C Great cardiac vein accompanies left anterior descending aery D Venae cordis minimi open into all four chambers 💡 Explanation WRONG about venous drainage of hea: ✓ Correct Answer: B. Middle cardiac vein lies in posterior atrioventricular groove