1- Formed by the ectoderm, mesoderm and endoderm by day 21 of development
embryonic disk
epiblast
primitive streak
primitive node

2- Gastrulation begins with the formation of the
primitive streak
primitive groove
notochord
right-left axis

3- The majority of the cells migrating through the primitive groove form the
ectoderm
mesoderm
endoderm
primitive streak

4- At about 18 days, the primitive streak extends caudally to
form the mesoderm
extend the primitive groove
extend the notochord
form the right-left axis

5- Its appearance identifies the antero-posterior and right-left axis
primitive streak
primitive groove
primitive node
notochord

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Answers:

1- Formed by the ectoderm, mesoderm and endoderm by day 21 of development
Answer: embryonic disk

2- Gastrulation begins with the formation of the
Answer: primitive streak

3- The majority of the cells migrating through the primitive groove form the
Answer: mesoderm

4- At about 18 days, the primitive streak extends caudally to
Answer: extend the notochord

5- Its appearance identifies the antero-posterior and right-left axis
Answer: primitive streak