UsefulLinks
Biology
Developmental Biology
Embryology
1. Introduction to Developmental Biology and Embryology
2. Gametogenesis
3. First Week of Development
4. Second Week of Development
5. Third Week of Development
6. Fourth to Eighth Week
7. The Fetal Period
8. Fetal Membranes and Placenta
9. Clinical Embryology and Teratology
10. Comparative Embryology
4.
Second Week of Development
4.1.
Implantation
4.1.1.
Timing and Site of Implantation
4.1.2.
Apposition
4.1.3.
Adhesion
4.1.4.
Invasion
4.1.5.
Decidual Reaction of the Endometrium
4.2.
Differentiation of the Trophoblast
4.2.1.
Cytotrophoblast
4.2.2.
Syncytiotrophoblast
4.2.2.1.
Invasive Properties
4.2.2.2.
Secretion of hCG
4.3.
Formation of the Bilaminar Disc
4.3.1.
Epiblast
4.3.2.
Hypoblast
4.4.
Formation of Embryonic Cavities
4.4.1.
Amniotic Cavity
4.4.2.
Primary Yolk Sac
4.4.3.
Secondary Yolk Sac
4.4.4.
Chorionic Cavity
4.5.
Extraembryonic Mesoderm
4.5.1.
Origin and Development
4.5.2.
Somatic Layer
4.5.3.
Splanchnic Layer
4.6.
Connecting Stalk
4.6.1.
Formation and Role
4.6.2.
Future Umbilical Cord
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5. Third Week of Development