Final answer:
The coronary sinus, a large vein within the coronary sulcus, drains the right atrium and right ventricle.
Step-by-step explanation:
The structure that lies in the coronary sulcus and drains the right atrium and right ventricle is the coronary sinus. This large, thin-walled vein is located on the posterior surface of the heart, within the atrioventricular sulcus, and empties directly into the right atrium. It drains most of the coronary veins that return systemic blood from the heart. Notable coronary veins that drain into the coronary sinus include the great cardiac vein, which receives blood from other major vessels such as the posterior cardiac vein, the middle cardiac vein, and the small cardiac vein. Therefore, the correct answer is 1) Coronary sinus.
Answer: 1) Coronary sinus