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Section of pregnant human foetus at the 7th or 8th week. Fallopian tubes into the cavity of the uterus; c1, cervix filled by a plug of mucus; dv, decidua vera; dr, decidua reflex; ds, decidua serotina; ch, chorion with its villi growing into the decidua reflex and decidua serotina; in the former the villi are becoming atrophied; u, umbilical chord, the dotted lines indicate blood vessels; al, allantois; y, yolk sac (umbilical vesicle); y1, its stalk, passing in the umbilical chord and connected with the intestine of the embryo, i; am, amnion. Jones Quain (November, 1796 - January 31, 1865) was an Irish anatomist, professor of Anatomy and Physiology in the University of London, and author of Elements of Anatomy. The first edition was published in 1828 and it quickly became a standard text-book in English-speaking countries.
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