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a and b: Anatomy of the interventricular septum. a Parasternal long-axis view of three portions of the interventricular septum: interventricular membranous septum, infundibular septum, and trabecular or muscular septum. b Parasternal short-axis view of the cardiac septum: atrialseptum, atrioventricular septum, and the membranous portion of the interventricular septum are shown
