Weeks 1-3 Development PDF
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This document details the stages of human embryonic development from weeks 1 to 3, focusing on implantation, the formation of the placenta, and the development of the embryonic disc. It also discusses various prenatal testing methods.
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1-3 08:03 6-10 3.1 Monday, November 21, 2022 Implantation Placenta decidua Amniotic sac ICM chorion 12 6-10 9-12 ICM Cytotrophoblasts Syncytiotrophoblasts hCG β-hCG hCG IUD - Intra-uterine device. Ectopic pregnancy Page 1 Ectopic pregnancy 2% 95-98% 9% 12-24% 50% ICM ICM Epiblast/Embryoblast ICM Hyp...
1-3 08:03 6-10 3.1 Monday, November 21, 2022 Implantation Placenta decidua Amniotic sac ICM chorion 12 6-10 9-12 ICM Cytotrophoblasts Syncytiotrophoblasts hCG β-hCG hCG IUD - Intra-uterine device. Ectopic pregnancy Page 1 Ectopic pregnancy 2% 95-98% 9% 12-24% 50% ICM ICM Epiblast/Embryoblast ICM Hypoblast/Primitive endoderm Umbilical vesicle 14 Embryonic disc Amniotic sac Amnion Umbrilical vesicle ICM Page 2 Chorionic villus sampling - CVS 10-12 Cordocentesis 22-24 Amniocentesis DNA 15-20 Non-invasing prenatal testing NIPT DNA false positive Germ layers Gastrulation Gastrula Ectoderm Mesoderm Endoderm , Primitive streak Primitive streak Page 3 1 Primitive node pit Primitive groove primitive groove Embryonic Primitive streak Primitive pit node Primitive streak streak primitive streak 2 3 4 ECM mesanchyme 5 16 Umbilical vesicle Embryonic/difinitive endoderm Primitive streak Primitive streak Primitive groove Primitive node Primitive groove Page 4 Primitive groove primitive streak. groove Cloacal membrane Oropharyngeal membrane Notochord Nucleus polposus Primitive node Intraembryonic mesoderm Extraemryonic mesoderm Umbilical vesicle Page 5
