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 Authors' Circular of Journalism (which prepared students for the examinations of the Institute of Journalists was printed in each issue, giving insight into the practical art of journalism as it was then conceived. Early in 1898, Charles Norris, secretary of the English School of Journalism, who was intimately involved in the production of its journal, died which destabilised the publication and its continuation. The Authors' Circular The Authors' Circular was a short-lived monthly publication of 16 pages running from January to April 1898. It was subtitled the "Official Organ of the English School of Journalism". It aimed to "foster business relations between