EntityQ3479076· pop 6· linked from 57 articlesseptum primumSign in to saveseptum that divides the atrium into a right and left atrium during the development of a human embryo's heartConnectionsLatinEntityinteratrial septumEntityendocardial cushionEntityheartEntitycirculatory systemEntitypublic domainEntityembryoEntityplacentaEntityDown syndromeEntityembryologyEntityaortaEntityumbilical cordEntityGray's AnatomyEntitypulmonary arteryEntityatriumEntityhemopoiesisEntityhypertrophyDiseaseinferior vena cavaEntitypulmonary hypertensionEntityyolk sacEntityCategoriesEmbryology of cardiovascular system