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Sections illustrating structure of placenta. A, vertical section through the margin of placenta at full term; D,D, deep layer of decidua; Vi, chorionic villi variously cut, their blood vessels injected; Si marginal space of the placenta, nearly free from villi; vi, aborted villi beyond placenta; Fib, canalized fibrin of Langhans, produced, according to Minot, by transformation of the superficial layer of chorionic epiblast. B, decidual tissue from a placenta at full term; v, blood vessel; d, d1, decidual cells; the latter with several nuclei. 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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