Fetal circulation video


Blood in the fetus flows from the post hepatic inferior vena cava to enter the right atrium. It is separated from the blood coming from head and neck region which pass into the right atrium by the intervenous tubercle so that blood from the SVC goes straight into the right ventricle and the other goes through the foramen ovale to the left atrium. The right ventricular blood then enters the pulmonary trunk to be shunted via the patent ductus arteriosus to the aorta from where it is passed to the rest of the body and the placenta. Blood which enter the left atrium is immediately passed into the left ventricle and from there to the ascending aorta and then systemic circulation. This fetal circulation is designed to shunt blood from the right to left so that blood is diverted from the immature lungs to the placenta through systemic circulation where it is oxygenated via the umbilical arteries and then umbilical veins.


Fetal circulation [Interactve video text]


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