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Flashcards in Week 2 Development Deck (20)
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1

Cytotrophoblast

Some of nutrition for embryo,

Not embedded

2

Syncytiotrophoblast

Embeddedd

3

Hypoblast

Inferior to epiblast, differentiated from embryoblast

4

Epiblast

All 3 primary tissue layers come from this, superior to hypoblast, differentiated from embryoblast

5

Amnioblasts

Epiblast cells adjacent to cytotrophoblast, form amniotic cavity

6

Exocoelomic (Heiser) Membrane

This and hypoblast forms lining of exocoelomic cavity

7

Other 2 names for Exocoelmic Cavity

Primitive yolk sac, primary umbilical vehicle

8

Lacunae

Vacuoles that appear in syncytium of embryonic pole, called the Lacunar Stage.

Blood vessels will invade these to set up blood flow

9

Cells of syncytiotrophoblast erode endothelial lining of maternal capillaries to form....

Sinusoids

10

When syncytial lacunae become continuous with sinusoids this establishes...

Uteroplacental circulation

11

New cells appear between inner surface of cytotrophoblast and outer surface of exocoelomic cavity to form...

Extramebryonic mesoderm

12

Large cavities form in extramebryonic mesoderm and form ...

Extraembryonic cavity (aka chorionic cavity) (aka extraembryonic coelom)

13

Extraembryonic mesoderm lining cytotrophoblast and amnion are ...

Extraembryonic somatic mesoderm

14

Extraembryonic mesoderm covering the yolk sac is...

Extraembryonic splanchnic mesoderm

15

Cytotrophoblasts form ________ to distinctly characterize this stage of development. These function as the main hold in the syncytial layer

Primary villi

16

Hypoblast produces cells that form the ________ and _________ from the primary yolk sac.

Secondary yolk sac (secondary umbilical vesicle) (definitive yolk sac)

Exocoelomic cysts

17

Extraembryonic mesoderm lining inside of cytotrophoblast is the ....

Chorionic plate (Extraembryonic somatic mesoderm)

18

Connecting stalk becomes the umbilical cord when...

It develops blood vessels

19

Tight fusion of epiblast and hypoblast, columnar cells form the ...

Prechordal plate

20

The prechordal plate will eventually become the....

Mouth (oral cavity)