The adult heart structure that marks the location of an opening between the two atria in the fetal heart is called the foramen ovale.
The foramen closes in the immediate postnatal time under the influence of increasing pressure in the cardiac chambers such as the placental flow stops which raise the right atrial pressure and the lungs are aerated and ventilation occurs, which increases the venous return from the lungs that also increases the left atrial pressures.
The foramen ovale is a gap or shunt withinside the coronary heart tissue permitting blood to float from the proper atrium to the left atrium throughout fetal development.
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