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Flashcards in Placenta Deck (20)
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1
Q

What does the syncytiotrophoblast give rise to?

A

the fetal placenta that invades the endometrium.

2
Q

What gives rise to the syncytiotrophoblast?

A

the cytotrophoblast

3
Q

when do the fetal components come into contact with the maternal blood?

A

end of the second week of gestation

4
Q

where do the villi develop from ?

A

the syncytiotrophoblast and the wall of the chorion

5
Q

What do the villi hold?

A

all the fetal blood vessels

6
Q

where is maternal blood dumped for exchange with the fetal components?

A

into the intervillus space which are separated into segments called cotyledons each separated by CT septa

7
Q

What is the maternal component of the placenta called?

A

decidua basalis

8
Q

What barriers exists for diffusion of nutrients and O2 from maternal blood to fetal villi?

A

the syncytiotrophoblast and the cytotrophoblast which continue along the villi to the decidua basal is where they also lie.

9
Q

What blood vessels supply the intervillus space?

A

uterine spiral arteries

10
Q

What is the fetal portion of the placenta called?

A

the chorionic plate (amnion and chorion fused)

11
Q

How can you tell the chorionic plate from the decidua basalis?

A

the chorionic plate looks more of a solid lighte pink with some white above it. the decidua basalis is more cellular looking and scattered cells, darker pink (up close)

12
Q

What is the chorion frondosum?

A

region of the chorion from which the villi extend toward the decidua basalis

13
Q

What type of a villi exists in the basal plate?

A

an anchoring villus that embeds into the decidua basalis

14
Q

What are the 3 different cells of the basal plate (decidua basalis)?

A

decidual cells: stromal cells of the endometrium that enlarge and because lighter pink and frothy looking
cytotrophoblastic cells: darker pink
fibrinoid: formed from both cell types and is highly eosinophilic compared to the two cell types.

15
Q

When do the villi consist of only syncytiotrophoblast cells?

A

in the last trimester the cytotrophoblastic cells become incorporated into the syncytiotrophoblastic layer so that the syn is the only layer around in the villi in the last trimester

16
Q

When do the RBCs of the fetus become non-nucleated?

A

third trimester (24-36 weeks)

17
Q

What does hCG do?

A

placenta makes hCG which causes the corpus luteum to continue secreting estrogen and progesterone and maintain the uterine lining

18
Q

Is the mucosa of the cervix shed during mestruation?

A

NO!

19
Q

If the vagina doesn’t have glands, where do its secretions come from?

A

cervical glands in the dense CT of the cervix

20
Q

What is the epithelium of the vagina?

A

stratified squamous non-keritinized overlying CT with lots of elastic fibers and thin-walled blood vessels. NO GLANDS!