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.
Farlex Partner Medical Dictionary © Farlex 2012
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High right atrial (RA) pressure in fetal life keeps the valve of foramen ovale open.