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 opening of the coronary sinus into the right atrium sits on the posterior aspect of the right atrial wall, near the interatrial septum. This location is the posterior septal wall, in the region where the coronary sinus runs in the posterior atrioventricular groove (coronary sulcus) and drains into the right atrium. It is distinct from the anterior wall, the roof, or the lateral wall, which are occupied by other structures and orientations. A small Thebesian valve may guard the ostium at its mouth, helping regulate flow between the coronary sinus and the right atrium.

The opening of the coronary sinus into the right atrium sits on the posterior aspect of the right atrial wall, near the interatrial septum. This location is the posterior septal wall, in the region where the coronary sinus runs in the posterior atrioventricular groove (coronary sulcus) and drains into the right atrium. It is distinct from the anterior wall, the roof, or the lateral wall, which are occupied by other structures and orientations. A small Thebesian valve may guard the ostium at its mouth, helping regulate flow between the coronary sinus and the right atrium.

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