Flashcards in Week 2 Development Deck (20)
Some of nutrition for embryo,
Inferior to epiblast, differentiated from embryoblast
All 3 primary tissue layers come from this, superior to hypoblast, differentiated from embryoblast
Epiblast cells adjacent to cytotrophoblast, form amniotic cavity
Exocoelomic (Heiser) Membrane
This and hypoblast forms lining of exocoelomic cavity
Other 2 names for Exocoelmic Cavity
Primitive yolk sac, primary umbilical vehicle
Vacuoles that appear in syncytium of embryonic pole, called the Lacunar Stage.
Blood vessels will invade these to set up blood flow
Cells of syncytiotrophoblast erode endothelial lining of maternal capillaries to form....
When syncytial lacunae become continuous with sinusoids this establishes...
New cells appear between inner surface of cytotrophoblast and outer surface of exocoelomic cavity to form...
Large cavities form in extramebryonic mesoderm and form ...
Extraembryonic cavity (aka chorionic cavity) (aka extraembryonic coelom)
Extraembryonic mesoderm lining cytotrophoblast and amnion are ...
Extraembryonic somatic mesoderm
Extraembryonic mesoderm covering the yolk sac is...
Extraembryonic splanchnic mesoderm
Cytotrophoblasts form ________ to distinctly characterize this stage of development. These function as the main hold in the syncytial layer
Hypoblast produces cells that form the ________ and _________ from the primary yolk sac.
Secondary yolk sac (secondary umbilical vesicle) (definitive yolk sac)
Extraembryonic mesoderm lining inside of cytotrophoblast is the ....
Chorionic plate (Extraembryonic somatic mesoderm)
Connecting stalk becomes the umbilical cord when...
It develops blood vessels
Tight fusion of epiblast and hypoblast, columnar cells form the ...