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
Use of restraints on pregnant women escape attempt." A number of health concerns have been raised by the American College of Obstetricians and Gynecologists (ACOG), the American Public Health Association, the American Medical Association and others surrounding the use of shackles on pregnant women. These concerns involve various increased health risks to the woman and her child, which arise at different points of shackling. While pregnant during incarceration, shackles can increase the risk of falling where a woman's center of gravity is shifted by the pregnant uterus. For example, restraints placed on a woman's wrists also prevent her from breaking a fall and protecting herself and