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 Cord and the Ax quo and character motivations in the first two episodes, in The Cord And The Ax the writers set out on a destructive path to destabilise just about every cosy structure they’d previously created. In doing this, they delivered both the very best of what Defiance does, and some of the worst, for good measure." The Cord and the Ax "The Cord and the Ax" is the third episode of the second season of the American science fiction series Defiance, and the series' fifteenth episode overall. It was aired on July 3, 2014. The episode was written by Allison Miller and