Embryology

  1. Second Week of Development
    1. Implantation
      1. Timing and Site of Implantation
        1. Apposition
          1. Adhesion
            1. Invasion
              1. Decidual Reaction of the Endometrium
              2. Differentiation of the Trophoblast
                1. Cytotrophoblast
                  1. Syncytiotrophoblast
                    1. Invasive Properties
                      1. Secretion of hCG
                    2. Formation of the Bilaminar Disc
                      1. Epiblast
                        1. Hypoblast
                        2. Formation of Embryonic Cavities
                          1. Amniotic Cavity
                            1. Primary Yolk Sac
                              1. Secondary Yolk Sac
                                1. Chorionic Cavity
                                2. Extraembryonic Mesoderm
                                  1. Origin and Development
                                    1. Somatic Layer
                                      1. Splanchnic Layer
                                      2. Connecting Stalk
                                        1. Formation and Role
                                          1. Future Umbilical Cord

                                        Previous

                                        3. First Week of Development

                                        Go to top

                                        Next

                                        5. Third Week of Development