Editing Umbilical cord (section)

===Connection to fetal circulatory system===
The umbilical cord enters the fetus via the [[Human abdomen|abdomen]], at the point which (after separation) will become the [[navel|umbilicus]] (belly button or navel). Within the fetus, the umbilical vein continues towards the [[Transverse fissure of liver|transverse fissure]] of the [[liver]], where it splits into two. One of these branches joins with the [[hepatic portal vein]] (connecting to its left branch), which carries blood into the liver. The second branch (known as the [[ductus venosus]]) bypasses the liver and flows into the [[inferior vena cava]], which carries blood towards the heart. The two umbilical arteries branch from the [[internal iliac arteries]] and pass on either side of the [[urinary bladder]] into the umbilical cord, completing the circuit back to the placenta.<ref>{{cite web|url=http://education.yahoo.com/reference/gray/subjects/subject/139 |title=Peculiarities in the Vascular System in the Fetus – Gray's Anatomy of the Human Body – Yahoo! Education |url-status=dead |archive-url=https://web.archive.org/web/20120123194946/http://education.yahoo.com/reference/gray/subjects/subject/139 |archive-date=January 23, 2012 }}</ref>