The foramen ovale
is a shallow depression in the interventricular septum
is a connection between the pulmonary trunk and the aorta in the fetus is a condition in which the heart valves do not completely close connected the two atria in the fetal heart g

is a shallow depression in the interventricular septum

Explanation:

The foramen ovale is a little hole found in the tissue which separates the two upper chambers of the heart, also known as the septum. Before his/her birth, a baby does not use his/her lungs, so he/she gets oxygenated blood from his/her mother's placenta, and this is distributed using the umbilical cord. The foramen ovale then allows the blood to flow from the right to the left sides of the baby's heart.

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