1. The Allantois obliterated forming the urachus, after that, it transformed into median umbilical ligament

2. What are Urachal Abnormalities? Before birth, there is a canal between the belly button and the bladder called the urachus

3. In animals of various species, all pregnant in the 3rd trimester, either 1. the amniotic cavity or 2. the fetal urinary bladder via the urachus was catheterized or 3. an indirect or 4. a direct vesico-pyelo-stomy was performed. These procedures serve to investigate the capsula protected homoiotransplantation of the kidney.