valve of foramen ovale

valve of fo·ra·men o·va·le

a fold projecting into the left atrium from the margin of the foramen ovale in the fetus; when, with beginning inspiration, the blood pressure within the left atrium increases, the valve closes and its edges become adherent to the margin of the foramen ovale, occluding it.
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High right atrial (RA) pressure in fetal life keeps the valve of foramen ovale open.