Umbilical cord from and contains remnants of the yolk sac and allantois. It forms by the fifth week of development, replacing the yolk sac as the source of nutrients for the embryo. The cord is not directly connected to the mother's circulatory system, but instead joins the placenta, which transfers materials to and from the maternal blood without allowing direct mixing. The length of the umbilical cord is approximately equal to the crown-rump length of the fetus throughout pregnancy. The umbilical cord in a full term neonate is usually about 50 centimeters (20 in) long and about 2 centimeters (0.75 in) in
The Umbilical Brothers extensive use of their particular style of mime and humour. In December 2006, in a "New York Post" interview, Shane Dundas expressed doubts about the return of the show for a second season. In June 2007, Nickelodeon announced that they would not renew it for a second season. The two had voice roles in "Maya the Bee" as ant soldiers, with Collins voicing Arnie and Dundas voicing Barney. The Umbilical Brothers have performed six shows, four of which appear as DVDs: The Umbilical Brothers Shane Dundas and David Collins known as The Umbilical Brothers are an Australian comic duo. Dundas