Fetal and postnatal circulation
• Figure 16.14
Umbilical vein
becomes
Ligamentum teres
Inferior vena cava
Abdominal aorta
Umbilical arteries
become
Medial umbilical ligaments
Umbilical cord
Placenta
Arch of aorta
Superior vena cava
Ductus arteriosus
becomes
Ligamentum arteriosum
Pulmonary artery
Foramen
ovale becomes
Fossa ovalis
Liver
Circulation at birth
Heart
Fetal circulation
Oxygenated blood
Oxygenated fetal blood travels from the placenta through the umbilical vein to
the liver and then to the heart. Blood passes through a hole between the atria
(foramen ovale) and a tube that connects the pulmonary and the aorta
(ductus arteriosus) and onward to fetal tissues. Deoxygenated blood returns
to the placenta through the umbilical arteries.
Mixed oxygenated and
deoxygenated blood
Deoxygenated blood
Pregnancy Lasts from Fertilization to Delivery
493
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