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Flashcards in Embryology 2 Deck (94)
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1

What happens during week 3?

Formation of germ layers (gastrulation)

Formation of neural tube (neurulatrion)

Development of somites

Early development of cardiovascular system

2

What are germ layers?

Layers that can germinate (grow into something)

3

What is the first thing that happens during week 3?

Formation of the primitive streak

4

Where is the primitive streak formed?

In the midline of the epiblast by the dipping in of cells (invagination)

5

What is the structure of the cells of the epiblast?

Columnar

6

What is formed once the primitive streak is formed?

Axis of the embryo

7

What does the axis of the embryo allow cells to know?

Where they are, at the head or the feet

8

What happens during gastruation?

Epiblast cells migrate into the space between the epiblast and hypoblast layers

9

What do the cells that migrate from the epiblast during gastrulation do, and cause the hypoblast to do?

Displaces the hypblast and forms 3 layers

10

What 3 layers do migrated cells from the epiblast during gastrulation form?

Ectoderm

Mesoderm

Endoderm

11

What do the migrated cells from the epiblast during gastrulation form?

Trilaminar disk

12

What is the trilaminar disk composed of?

Ectoderm

Mesoderm

Endoderm

13

What is 1?

Ectoderm

14

What is 2?

Mesoderm

15

What is 3?

Endoderm

16

What does the ectoderm, mesoderm and endoderm originate?

Epiblast

17

What happens to the cells during the formation of the trilaminar disk?

They become specialised, so can only go on to form certain things

18

What is formed after the trilaminar disk?

Notochord

19

What is the notochord?

Solid tube of cells

20

What does the notochord induce?

Ectodermal cells in the midline to form a neural tube (neurulation)

21

What does the neural tube and notochord originate from?

Ectoderm

22

What is A?

Paraxial mesoderm

23

What does the neural tube induce?

Mesoderm to thicken

24

What happens after the mesoderm thickens?

Seperates into 3 parts:

 

Paraxial mesoderm

Intermediate plate mesoderm

Lateral plate mesoderm

25

What does the thickened mesoderm seperate into?

Paraxial mesoderm

Intermediate plate mesoderm

Lateral plate mesoderm

26

What is B?

Intermediate plate mesoderm

27

What is C?

Lateral plate mesoderm

28

What are the paraxial mesoderm, intermediate plate mesoderm and lateral plate mesoderm formed from?

Mesoderm

29

What happens after the mesoderm splits into the paraxial, intermediate and lateral plate mesoderm?

Lateral plate mesoderm splits to form:

 

Somatic mesoderm

Splanchnic mesoderm

Space between the 2 called intraembryonic coelom

30

What does the lateral plate mesoderm split into?

Somatic mesoderm

Splanchnic mesoderm