Gastrula

Question 1

The first stage of morphogenesis whereby cells undergo complex movement that forms the organ rudiments.

Answer 1

Gastrulation

Question 2

Gastrulation differentiates into 3 germ layers

Answer 2

1. Outer ectoderm
2. Inner endoderm
3. Middle mesoderm

Question 3

This stage is characterized by the invagination of blastoderm which form a new cavity. What is the cavity?

Answer 3

Gastrocoele, archenteron, primitive gut

Question 4

Prior to gastrulation, the blastoderm divides into upper layer and lower layer. What are the layers?

Answer 4

Upper - epiblast
Lower - hypoblast

Question 5

Cells continue to move by involution forming an opening with a mass yolk called the _

Answer 5

Yolk plug

Question 6

In the area of inner cell mass, the overlying trophoblast degenerates with consequent proliferation of the cells of the inner cell mass. This forms a disk-shaped, thickened area called _

Answer 6

Embryonic disc