The coronary sinus ostium is located on which wall of the right atrium?

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Study for the EPU Electrophysiology Exam with comprehensive questions and explanations. Enhance your knowledge with flashcards and a variety of question formats to ensure you are prepared to excel!

Multiple Choice

The coronary sinus ostium is located on which wall of the right atrium?

Explanation:
The coronary sinus ostium sits on the posterior aspect of the right atrial wall, specifically near the interatrial septum. This posterior septal location allows blood from the coronary veins to drain directly into the right atrium in a region away from the tricuspid valve and the superior/inferior vena cava openings. Occasionally a small valve of Thebesius is present at the ostium, which can partially cover the opening. The other wall locations—anterior, lateral, or roof—do not accommodate the typical placement of the coronary sinus ostium, which is why those options aren’t correct.

The coronary sinus ostium sits on the posterior aspect of the right atrial wall, specifically near the interatrial septum. This posterior septal location allows blood from the coronary veins to drain directly into the right atrium in a region away from the tricuspid valve and the superior/inferior vena cava openings. Occasionally a small valve of Thebesius is present at the ostium, which can partially cover the opening.

The other wall locations—anterior, lateral, or roof—do not accommodate the typical placement of the coronary sinus ostium, which is why those options aren’t correct.

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