Median vesical ligament

The median vesical ligament is a fibrous remnant of the embryonic urachus, which is the duct connecting the fetal bladder to the allantois. After birth, it becomes a vestigial structure.

It extends from the bladder apex to the ventral abdominal wall, and sometimes continuing toward the umbilicus. It is flanked laterally by the lateral vesical ligaments, which may contain remnants of the umbilical arteries.

In humans, this structures is termed as median umbilical ligament (covered by the median umbilical fold of parietal peritoneum) but this terme is not appropriate for the quadrupeds because the bladder is not retroperitoneal in human, and the ligament has a more obvious relation to the bladder than to the umbilic in animals.