Coronary Sinus Right Atrium — FRCA Primary MCQ
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Correct answer: A — Right atrium
The coronary sinus is the main venous drainage of the heart. It runs in the posterior atrioventricular groove and drains into the right atrium between the IVC orifice and the tricuspid valve. It receives: the great / middle / and small cardiac veins and the left posterior ventricular and oblique veins.
Reference: RCoA 2021 Primary FRCA Curriculum