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Flashcards in Implantation Deck (18)
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1

What is the bilaminar embryonic disc composed of?

An epiblast layer and a hypoblast layer

2

What is the epiblast?

A layer of the bilaminar embryonic disc which forms the amniotic cavity and amnioblast

3

What is the amniotic cavity formed from?

The epiblast cells of the bilaminar embryonic disc. Amnioblast cells secrete amniotic fluid (these are also derived from epiblast cells)

4

What is the primitive yolk sac formed from?

Hypoblast cells of the bilaminar embryonic disc

5

What lines the primitive yolk sac and what are these cells derived from?

The exocoelemic membrane, derived from the hypoblast

6

What is the exocoelemic membrane?

A membrane derived from hypoblast cells of the bilaminar embryonic disc which surrounds the primitive yolk sac

7

Where does the embryo derive its nutrition during implantation

From the yolk sac which is derived from the hypoblast cells of the bilaminar embryonic disc

8

What is the extra-coelemic membrane?

An area between the cytotrophoblast and the embryo which completely surrounds the embryonic tissue by day 12

9

What attaches the embryo to the cytotrophoblast by day 3?

An extra-embryonic stalk of mesoderm which will later become the umbilical cord.

10

When does the syncytiotrophoblast start to secrete BHCG?

By the end of second week

11

When is BHCG present in the urine?

By the end of the second week

12

What does the epiblast transform into by the third week?

The ectoderm

13

What does the hypoblast transform into by the third week?

The endoderm

14

What is the ectoderm derived from?

The epiblast

15

What is the endoderm derived from?

The hypoblast

16

What is the intraembryonic mesoderm derived from?

The ectoderm

17

What is the trilaminar disc formed of?

Ectoderm, intreembryonic mesoderm, endoderm

18

When does the trilaminar disc form?

By the 3rd week