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Flashcards in Week 3 Development Deck (12)
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1

Gastrulation

Formation of 3 embryonic layers
- ectoderm
- mesoderm
- endoderm
(All 3 form epiblast)

2

Gastrulation begins with the formation of the...

Primitive streaks

3

The primitive streak moves from the ____ end to the ____end

Caudal, cranial

4

Prechordal plate is formed between the tip of the notochord and the ....

Oropharyngeal membrane. (Future opening of oral cavity)

5

The notochordal process is formed by..

Prenotochordal cells that invaginate in the primitive pit

6

The notochordal process grows cranially from the primitive node until reaches the prechordal plate and squires a lumen. This is called the...

Notochordal canal

7

The floor of the notochordal process fuses with endoderm and the endoderm degenerates, the amniotic cavity now has open connection with umbilical vesicle through what is known as the....

Neurenteric canal

8

Cloacal membrane forms on caudal end, analogous to...

Oripharyngeal membrane (cranial side)

9

Mesodermal cells penetrate core of primary villi making them now the....

Secondary villus

10

End of week 3, mesodermal cells differentiate into blood cells and small blood vessels making them now...

Tertiary villus

11

Vasculogenesis

Blood vessels arise from blood islands

12

Angiogenesis

Blood vessels sprouting from existing vessels