Section through the heart of human embryo showing the formation of the cardiac septa and the auriculo-ventricular valves, (see 9N3690) from a somewhat more advanced embryo. Ad, As, right and left auricle; Ost, auriculo-ventricular apertures; S.s, septum superior of auricles; S. it, endocardial cushion (septum intermedium); S. if, septum infers ventriculorum, now denser and more muscular. 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. This image has been colorized.
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