Lecture 14 - The Trilaminar Embryo Flashcards
1
Q
when does gastrulation begin
A
beginning of week 3
2
Q
what signals the beginning of gastrulation
A
the epiblasts proliferate and migrate medially
3
Q
what way does the primitive streak elongate
A
cranially
4
Q
what is the embryonic mesoderm formed from
A
the primitive streak when cells migrate in between the epiblasts and hypoblasts
5
Q
what is the embryonic endoderm formed from
A
cells that migrate from epiblasts through the hypoblasts
6
Q
what does the primitive streak determine
A
cranial and caudal axis of the embryo
7
Q
what does the epiblast give rise to
A
all three germ layers in the embryo
8
Q
when does the primitive streak degenerate
A
the end of the fourth week
9
Q
where does gastrulation begin
A
the caudal end of the embryo
