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Longitudinal section of a 25-day embryo showing the head and tail folds. Note the position of the septum transversum between the pericardial cavity and the yolk sac. | (2020) Septum Transversum – an overview | ScienceDirect Topics. Retrieved February 11, 2020, from https://www.sciencedirect.com/topics/medicine-and-dentistry/septum-transversum