Skip Navigation
Stage 1 / 1 day Stage 2 / 2-3 days Stage 3-1 / 4 days Stage 3-2 / 4-5 days Stage 4 / 6 days Stage 5a-1 / 7 days Stage 5a-2 / 8 days Stage 5b / 9 days Stage 5c / 12 days Stage 6 / 13-17 days Stage 7 / 16-19 days Stage 8 / 23 days Stage 9 / 25 days Stage 10 / 28 days Stage 11 / 29 days Stage 12 / 30 days Stage 13 / 32 days Stage 14 / 33 days Stage 15 / 36 days Stage 16 / 39 days Stage 17 / 41 days Stage 18 / 44 days Stage 19 / 45-47 days Stage 20 / 49 days Stage 21 / 49-52 days Stage 22 / 52-55 days Stage 23 / 56 days
Atlas of Human Embryos Chapter   Figure

allantois, aortic sac, atrioventricular junction, bulbis cordis, caudal neuropore, cephalic neuropore, cloaca, common umbilical artery, cut edge of umbilical vesicle, facio-vestibulocochlear neural crest (CN VII and CN VIII), foregut, head fold, internal carotid artery, left aortic arch 1, left aortic arch 2, left atrium, left dorsal aorta, left sinus venosus, left umbilical vein, left vitelline (omphalomesenteric) vein, mesencephalon, neural tube, pharyngeal groove 1, primary head vein, primitive ventricle of heart, prosencephalon (forebrain), rhombencephalon (hindbrain), right atrium, tail fold, trigeminal neural crest (CN V), vitelline plexus

Left lateral view of the 10-somite embryo showing the cardiovascular system. Arrows indicate the position of head and tail folds.


Keywords: allantois, aortic sac, atrioventricular junction, bulbis cordis, caudal neuropore, cephalic neuropore, cloaca, common umbilical artery, cut edge of umbilical vesicle, facio-vestibulocochlear neural crest (CN VII and CN VIII), foregut, head fold, internal carotid artery, left aortic arch 1, left aortic arch 2, left atrium, left dorsal aorta, left sinus venosus, left umbilical vein, left vitelline (omphalomesenteric) vein, mesencephalon, neural tube, pharyngeal groove 1, primary head vein, primitive ventricle of heart, prosencephalon (forebrain), rhombencephalon (hindbrain), right atrium, tail fold, trigeminal neural crest (CN V), vitelline plexus

Source: Atlas of Human Embryos.