Section through the heart of human embryo showing the formation of the cardiac septa and the auriculo-ventricular valves, 5 to 6 weeks. , right auricle; , left auricle; , right horn of sinus; , 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.
Human Embryo, Heart Development
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Photo credit: © Science History Images / Alamy / Afripics
License: Licensed
Model Released: No
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