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Section through the heart of human embryo showing the formation of the cardiac septa and the auriculo-ventricular valves, 5 to 6 weeks. R.V, right auricle; L.V, left auricle; S.r.d, right horn of sinus; Sr.s, left horn of sinus; s. int, septum superior and endocardial cushion (septum intermedium); s. inf, septum infers ventriculorum; This septum, as well as the bulk of the ventricle, is a muscular sponge at this stage. Oc, esophagus; Br, bronchus. 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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