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Flashcards in Placenta Deck (14)
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1

When is the uterus receptive to implantation?

Days 16-20 of the menstrual cycle

2

What two hormones control the ovarian cycle?

FSH and LH

3

When is progesterone level high?

During ovulation

4

What do stromal cells differentiate into?

Decidual cells

5

What is the function of the decidual cells?

Control degree of implantation

6

What does the hypoblast form?

Yolk sac

7

What does the trophoblast form?

Placenta

8

What is the function of the yolk sac in mammals?

Primordial germ cells arise from the extraembryonic mesoderm near the base of the allantois.
Extraembryonic haematopoiesis

9

What is the function of allantois in humans?

Vestigial
May be involved in respiration- blood cells differentiate from the mesoderm

10

What are the two parts of the trophoblast?

Syncytiotrophoblast and cytotrophoblast.

11

What is the syncytiotrophoblast

- Lines the villous
- Multinucleated
- Bathed in maternal blood
Formed from the fusion of cytotrophoblast cells

12

What is the cytotrophoblast?

- Proliferative cell column
- Beneath the syncyitotrophoblast
- Differentiate into the syncytiotrophoblast or the invasive trophoblast

13

What is the invasive trophoblast?

- Extravillous trophoblast from the cytotrophoblast

14

What are the two types of invasive extravillous trophoblast?

Interstitial (iEVT) or endovascular (eEVT).