MORE UMBILICAL VESTIGES. “Umbilical arteries → umbilical ligaments, and the superior vesicular artery supplying the urinary bladder. Umbilical arteries give way to a functional section of the internal iliac arteries and superior vesicular artery that delivers blood to the dorsal portion of the urinary bladder, as well as a non-functional, obliterated portion (which led to the umbilical cord) that becomes the medial umbilical ligament.”
https://evolution-outreach.springeropen.com/articles/10.1186/s12052-014-0012-5