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; , septum superior of auricles; S. it, endocardial cushion (septum intermedium); S. if, septum infers ventriculorum, now denser and more muscular.
Human Embryo, Heart Development
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Photo credit: © Science History Images / Alamy / Afripics
License: Licensed
Model Released: No
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