The human heart at seven postovulatory weeks.
D002319:Cardiovascular System / Q000196:embryology; D005260:Female; D005306:Fertilization; D005865:Gestational Age; D006321:Heart / Q000033:anatomy & histology / Q000196:embryology*; D006325:Heart Atria; D006352:Heart Ventricles; D006801:Humans; D009206:Myocardium; D011247:Pregnancy; D013997:Time Factors