The Eustachian valve, which is of no signific | vedclass

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(B) The Eustachian valve is a fold of the endocardium located at the opening of the inferior vena cava into the right atrium of the heart.In the fetal

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Sinus venosus

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(B) The Eustachian valve is a fold of the endocardium located at the opening of the inferior vena cava into the right atrium of the heart.In the fetal stage, it directs oxygenated blood from the inferior vena cava towards the foramen ovale, allowing it to bypass the non-functional fetal lungs.After birth, as the circulation pattern changes and the foramen ovale closes, the Eustachian valve loses its functional significance and becomes a vestigial structure.It is considered a remnant or vestige of the $Sinus venosus$, which is the embryonic structure that gives rise to parts of the right atrium in the mammalian heart.

The Eustachian valve, which is of no significance in the adult mammal, is a vestigial organ. It is a vestige of which structure?

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