WAnterior cardinal vein
WAortic arches
WAortic sac
WAorticopulmonary septum
WBlood islands
WBulbus cordis
WChorionic vessels
WCommon cardinal veins
WDorsal aorta
WDuctus arteriosus
WDuctus venosus
WEndocardial cushions
WFetal circulation
WFetal circulation
WFetal hemoglobin
WForamen ovale (heart)
WForamen secundum
WHeart development
WInteratrial septum
WPlacenta
WPosterior cardinal vein
WPrimary interatrial foramen
WPrimitive atrium
WPrimitive ventricle
WSeptum intermedium
WSeptum primum
WSeptum secundum
WSeptum spurium
WSinus venosus
WSpina vestibuli
WTruncus arteriosus
WTubular heart
WUmbilical artery
WUmbilical vein
WVitelline arteries
WVitelline circulation
WVitelline veins
WYolk sac