Gastrulation Flashcards
1
Q
When does gastrulation occur?
A
3rd Week
2
Q
What is established in gastrulation?
A
3 germ layers, Ectoderm + Mesoderm + Endoderm
3
Q
Ectoderm gives rise to…
A
Skin and Nervous tissue
4
Q
Mesoderm gives rise to…
A
Connective tissue
5
Q
Endoderm gives rise to…
A
Epithelium (Lung and gut)
6
Q
What does gastrulation begin with?
A
Formation of the primitive streak on epiblast
7
Q
What does FGF8 control?
A
Invagination of epiblast cells into primitive streak
8
Q
What does invagination do?
A
Displaces the hypoblast forming the endoderm
9
Q
Area between epiblast and new endoderm
A
Mesoderm
10
Q
What area forms germ layers first?
A
Head region first, then caudal by end of 4th week
11
Q
What do all 3 germ layers come from?
A
Epiblast
