Urachus
Structure of the urinary system / From Wikipedia, the free encyclopedia
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Not to be confused with Vitelline duct.
The urachus is a fibrous remnant of the allantois, a canal that drains the urinary bladder of the fetus that joins and runs within the umbilical cord.[1] The fibrous remnant lies in the space of Retzius, between the transverse fascia anteriorly and the peritoneum posteriorly.