The Eustachian ridge is located posterior to which structure?

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Multiple Choice

The Eustachian ridge is located posterior to which structure?

Explanation:
The right atrial Eustachian ridge is a muscular crest that marks the boundary around the opening of the inferior vena cava. The coronary sinus drains into the right atrium along the posterior wall near this region. On anatomical and imaging views, the coronary sinus opening is in front of the ridge, so the Eustachian ridge sits behind it. Therefore, the Eustachian ridge is posterior to the coronary sinus.

The right atrial Eustachian ridge is a muscular crest that marks the boundary around the opening of the inferior vena cava. The coronary sinus drains into the right atrium along the posterior wall near this region. On anatomical and imaging views, the coronary sinus opening is in front of the ridge, so the Eustachian ridge sits behind it. Therefore, the Eustachian ridge is posterior to the coronary sinus.

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