---primitive cardiovascular system /heart tube paired, by the 4th week, which fuse /arteries dorsal aorta vitelline artery 心管 umbilical artery aortic arch 6 pairs /veins. anterior cardinal vein posterior cardinal vein common cardinal vein主动 vitelline vein 静脉窦 umbilical vein
---primitive cardiovascular system: /heart tube: paired, by the 4 th week, which fuse /arteries: -dorsal aorta: -vitelline artery -umbilical artery -aortic arch: 6 pairs /veins: -anterior cardinal vein -posterior cardinal vein -common cardinal vein -vitelline vein -umbilical vein
2. Development of heart 1)Formation of primitive heart cardiogenic plate: proliferation of splanchnic mesodermal cell to form a pair of longitudinal cell cord. then differentiate into cardiac tube pericardiac coelom: space in mesoderm 围心腔 生心索
2. Development of heart 1) Formation of primitive heart ---cardiogenic plate: proliferation of splanchnic mesodermal cell to form a pair of longitudinal cell cord, then differentiate into cardiac tube ---pericardiac coelom: space in mesoderm
rapid growth of brain vesicles pulls the buccopharyngeal membrane,/the cardiogenic plate and pericardiac coelom forward 围心腔
---rapid growth of brain vesicles pulls the buccopharyngeal membrane, the cardiogenic plate and pericardiac coelom forward
lateral folds of the embryo make the two cardiac tube approach andfuse with each other 背主动脉 心管 e
---lateral folds of the embryo make the two cardiac tube approach and fuse with each other
dorsal mesocardium cardiac tube Invaginate into 心背系膜 pericardiac coelom and connect to it by dorsal mesocardium 心背系膜
---dorsal mesocardium: cardiac tube invaginate into pericardiac coelom and connect to it by dorsal mesocardium