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The '''umbilical vein''' is a [[vein]] present during fetal development that carries [[oxygenated blood]] from the [[placenta]] to the growing [[fetus]].
The blood pressure inside the umbilical vein is approximately 18 mmHg.<ref>[http://www.embryology.ch/anglais/fplacenta/circulplac01.html Fetal and maternal blood circulation systems] From Online course in embryology for medicine students. Universities of Fribourg, Lausanne and Bern (Switzerland). Retrieved on 6 April
==Fetal circulation==
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==Closure==
Within a week of birth, the infant's umbilical vein is completely obliterated and is replaced by a fibrous cord called the [[Round ligament of liver|round ligament of the liver]] (also called ''ligamentum teres hepatis''). It extends from the umbilicus to the transverse fissure, where it joins with the [[falciform ligament of the liver]] to separate
Closure of the umbilical vein usually occurs after the [[umbilical arteries]] have closed. This prolongs the communication between the placenta and fetal heart, allowing for a sort of [[autotransfusion]] of remaining blood from the placenta to the fetus.
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==Additional images==
<gallery>
Image:Gray31.png|Model of human embryo 1.3
Image:Gray39.png|Scheme of placental circulation.
Image:Gray458.png|Diagram of the vascular channels in a human embryo of the second week.
Image:Gray476.png|Human embryo with heart and anterior body-wall removed to show the sinus venosus and its tributaries.
Image:Gray989.png|Schematic figure of the bursa omentalis, etc. Human embryo of eight weeks.
Image:Gray1088.png|Liver with the septum transversum. Human embryo 3
Image:Gray1115.png|Tail end of human embryo twenty-five to twenty-nine days old.
File:Umbilical vein.jpg|Umbilical vein
File:Slide1MINI.JPG|Human embryo, 38
</gallery>
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