Development of embryo and fetus initio embryo:≤8 weeks 2. Fetus:29 weeks human shape
Development of embryo and fetus Circulation>° 1).fetus <>placenta- mater 2)1 umbilical vein(full of oxygen), 2 umbilical artery(lack of oxygen 3)Mixed blood (vein and artery)
Heac ss Ductus ovae InTerior Ductus enosis Umbilical venn Umbilical Piacente erter oa viscera lower trunk
Development of embryo and fetus 2, Hematology 1) Erythropoiesis s From yolk sac: 3 weeks 4 From liver: 10 weeks From bone marrow and spleen term(90%) EPO production: 32nd week
Development of embryo and fetus 2)Fetal hemoglobin Fetal hemoglobin; early pregnancy Adult hemoglobin: 32nd week Term; fetal type Hb 25%0 3)White cells Leukocytes: 8 week ymphocytes(antibody production): 123 week, thymus and spleen