KIVO Med
The second week of embryonic development
Follow implantation and the transformations that organize the blastocyst into a bilaminar embryo and early extraembryonic structures from day 8 to day 15.
- 81 explained questions
- 24 flashcards
- 134 estimated course minutes
Updated
What you will learn
- Place the events of the second week between day 8 and day 15 of development.
- Explain the preparation and stages of implantation in a receptive endometrium.
- Describe trophoblast, bilaminar disc, cavity and extraembryonic mesoderm transformations.
- Relate the chronology of trophoblastic villi and uteroplacental circulation to the final organization of the second week.
Course outline
Landmarks of the second week
Build a temporal and functional map of implantation and blastocyst transformation from day 8 to day 15.
10 min
Preparing for implantation
Relate blastocyst hatching to cyclic endometrial receptivity and to the indispensable role of progesterone.
14 min
Apposition, adhesion and molecular dialogue
Describe the three preliminary stages that orient and then stabilize blastocyst contact with the uterine epithelium.
16 min
Endometrial invasion and decidual reaction
Follow epithelial crossing, embedding in the chorion and endometrial adaptation through day 13.
17 min
Trophoblast, bilaminar disc and amniotic cavity
Identify the cell differentiations that organize trophoblast and inner cell mass on day 8.
16 min
Lacunar stage, Heuser membrane and primary yolk sac
Describe the day 9–10 events that open trophoblastic lacunae and build the primary yolk sac.
18 min
Extraembryonic mesoderm, circulation and secondary yolk sac
Relate uteroplacental circulation to extraembryonic mesenchyme, primary villi and secondary yolk sac formation.
21 min
Extraembryonic coelom and the day 14–15 overview
Complete the second-week map with the coelom, embryonic stalk, secondary villi and the day-15 bilaminar disc.
22 min
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