In fetal circulation, blood travels directly from the right atrium to the left atrium through the foramen ovale.

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The foramen ovale is a small opening between the right atrium and left atrium in the developing fetus. Blood flows from the right atrium through the foramen ovale and directly into the left atrium, bypassing the pulmonary circulation. This allows oxygenated blood from the placenta to be distributed to the fetal tissues without having to go through the lungs. After birth, the foramen ovale typically closes and blood flows through the lungs for oxygenation.

In Fetal Circulation, Blood Travels Directly from the Right Atrium