The ostium of the coronary sinus opens into which part of the right atrium?

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Prepare for the Electrophysiology Unit (EPU) 26.19 exam with our interactive quiz featuring flashcards and multiple choice questions. Check your understanding with hints and explanations for each question.

Multiple Choice

The ostium of the coronary sinus opens into which part of the right atrium?

Explanation:
The essential point is where the coronary sinus ends as it drains into the right atrium. The coronary sinus opens into the right atrium in the posteroseptal region—the posterior wall near the interatrial septum. This location places the ostium on the posterior wall close to the septal side, rather than on the anterior, superior, or inferior walls. Thebesian valve may guard this ostium, helping regulate flow between the coronary sinus and the right atrium.

The essential point is where the coronary sinus ends as it drains into the right atrium. The coronary sinus opens into the right atrium in the posteroseptal region—the posterior wall near the interatrial septum. This location places the ostium on the posterior wall close to the septal side, rather than on the anterior, superior, or inferior walls. Thebesian valve may guard this ostium, helping regulate flow between the coronary sinus and the right atrium.

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