Abstract
Before birth, the respiratory functions of the lungs are performed by the placenta and, as a consequence, the umbilical (allantoic) or placental veins carry oxygenated blood back to the heart. Functionally, the umbilical veins of the embryo and fetus are comparable to the postnatal pulmonary veins.
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© 1987 Springer-Verlag New York Inc.
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Coalson, R.E. (1987). Fetal Circulation and Changes at Birth. In: Embryology. Oklahoma Notes. Springer, New York, NY. https://doi.org/10.1007/978-1-4684-0284-1_20
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DOI: https://doi.org/10.1007/978-1-4684-0284-1_20
Publisher Name: Springer, New York, NY
Print ISBN: 978-0-387-96334-1
Online ISBN: 978-1-4684-0284-1
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