TOPICS: Embryonic precursors, cardiac looping, septation of the atria, septation of the ventricles, septation of the outflow tract, early fetal development, truncus arteriosus, bulbus cordis, primitive ventricle, primitive atria, primitive pulmonary vein, right horn of sinus venosus, left horn of sinus venosus, right common cardinal vein, endocardial cushion, posterior veins, subcardinal veins, supracardinal veins, ascending aorta, pulmonary trunk, left ventricle, right ventricle, left atria, right atria, smooth portion of the heart, trabeculated portion of the heart, coronary sinus, superior vena cava, inferior vena cava, atrial septum, membranous interventricular septum, AV valves, semilunar valves, adult derivatives of embryonic structures, left circumflex artery, posterior descending artery, right horn of sinus venosus, atrioventricular canals, dynein defects, dextrocardia, Kartagener syndrome, foramen primum, foramen secundum, foramen ovale, septum primum, septum secundum, muscular interventricular septum, aorticopulmonary septum