The urachus is a fibrous remnant of the allantois, a canal that...
wikipedia - 15 Nov 2021The 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.