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Which structure is the arrow pointing to in this video?
Suggested Answer: C
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The arrow points to the coronary sinus, which is a venous structure located posteriorly in the atrioventricular groove, emptying into the right atrium. It appears as a circular anechoic structure near the left atrium in echocardiographic images.
Left lower pulmonary vein enters the left atrium more superiorly. Descending aorta is posterior to the heart but not in this location. Left atrial appendage is an anterior finger-like projection of the left atrium, separate from the coronary sinus.
This anatomy is described in the 'Textbook of Clinical Echocardiography, 6e', Chapter on Cardiac Venous Anatomy20:140-145Textbook of Clinical Echocardiography.
4 comments · newest first
AS
Ashley
39 minutes ago
I feel like the descending aorta is a possibility too, but I can't recall the exact position in the video.
PA
Patrick
5 days ago
I keep mixing up the left lower pulmonary vein and the left atrial appendage. I really need to review those structures again.
FE
Felicitas
10 days ago
This looks similar to a practice question we did on the anatomy of the heart. I remember the coronary sinus being a tricky one.
ME
Melinda
16 days ago
I think the arrow might be pointing to the left atrial appendage, but I'm not entirely sure.