Weeks 2 and 3 Development Flashcards Preview

Anatomy Test One Material > Weeks 2 and 3 Development > Flashcards

Flashcards in Weeks 2 and 3 Development Deck (13)
Loading flashcards...
1

On day 8 the trophoblast differentiates into what?

Cytotrophoblast and the syncytiotrophoblast

2

On day 8 the embryoblast differentiates into what?

Hypoblast and epiblast

3

On day eight what cavity forms?

The amniotic cavity

4

What are amnioblasts?

These are epiblast cells taht are adjacent to cytotrophoblasts

5

What is the exocoelomic cavity?

The primitive yolk sac

6

On day nine what fills in the tiny endometrial wall?

Fibrin coagulum

7

On days 11 and 12 what is the trophoblast characterized by?

Lacunar spaces in the syncytium

8

When is the uteroplacental circulation established?

Days 11 and 12

9

When do extramebryonic mesoderm cells appear between the inner surface of cytotrophoblast and the outer surface of the exocoelmic cavity?

Days 11 and 12

10

When does the extraembryonic cavity (aka chorionic cavity) form?

Days 11 and 12

11

What are the 5 main things that happen in week two of development? (the week of two's)

1.implantation complete; 2.trophoblast differentiates into 2 layers; 3.embryoblast forms 2 layers; 4.extraembryonic mesoderm splits into 2 layers; 5.2 cavities form

12

What are the five main things that happen in week three of development?

1.formation of primitive streak & node; 2.gastrulation occurs; 3.formation of notochord; 4.establishment of body axes; 5.growth of the embryo

13

What is gastrulation?

Formative process by which the three primary germ layers form (ectoderm, mesoderm, endoderm).