Umbilical cord diameter. This diameter decreases rapidly within the placenta. The fully patent umbilical artery has two main layers: an outer layer consisting of circularly arranged smooth muscle cells and an inner layer which shows rather irregularly and loosely arranged cells embedded in abundant ground substance staining metachromatic. The smooth muscle cells of the layer are rather poorly differentiated, contain only a few tiny myofilaments and are thereby unlikely to contribute actively to the process of post-natal closure. The umbilical cord contains Wharton's jelly, a gelatinous substance made largely from mucopolysaccharides which protects the blood vessels inside. It contains one vein, which
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