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 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 those who write and those who publish," reflecting the increased professionalization of journalism. Advice on pitching to editors and defending intellectual property, gossip about the literary scene, insight into the means by which editors selected copy for publication, and a correspondence section in which such issues were discussed made up the bulk of the magazine. The syllabus for the English School