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Embryology > The Placenta > Flashcards

Flashcards in The Placenta Deck (31):
1

What are the fetal membranes

chorion, amnion, yolk sac and the allantois

2

functions of the placenta

protection, nutrition, respiration, excretion and hormone production

3

the __________are part of the fetal placenta unit

suprarenal gland

4

The fetal part of the placenta arises from

chorionic sac

5

the maternal part of the placenta arises from

endometrium

6

the maternal part of the placenta is called

decidua

7

What is the decidua reaction ?

with increasing levels of progesterone, the connective tissue cells of the decidua become enlarged and pale staining and help protect the uterus against complete invasion of the synctiotrophoblast

8

decuda basalis

deep to the fetus (base of implantation site)

9

decidua capsularis

overlying the fetus (covers the implantation site)

10

decidua parietalis

everything else (part of the decidua not implantation site or covering of it

11

what does the trophoblast give rise too ?

cytotrophoblast and syncytiotrophoboblast

12

what forms the layers of the chorion ?

somatic layer of extraembryonic mesoderm and layers of trophoblasts

13

chorionic villi will attacht to the _____ via the ____________ and serves to anchor the chorionic sac

decidua basalis, cytotrophoblast

14

what four things does the chorionic membrane consist of

syncytiotrophoblast, cytotrophoblast, embryoonic ct, and endothelium of fetal vessels

15

what does the fetal part of the placenta do ?

seperates the fetus from the endometrium of the uterus

16

what do the fetal membranes include

chorion, amnion, yolk sac, and the allantois

17

what fills the primary villi to form the secondary villi

somatic mesoderm

18

the presence of blood vessels designates what ?

tertiary villi

19

the fetal placenta is the

villous chorion

20

maternal placenta is

decidua basalis

21

where is the intervillous space derived from ?

lacunar network that formed in the syncytiotrophoblasts in the second week

22

the intervilous space is drained by what veins

endometrial veins

23

amniochorionic membrane

fusion of amniotic and chorionic sac (ruptures during labor) and membrane fuses with decidua capsularis and then adheres to decidua parietalis obliterating the uterine lumen

24

what does the placenta membrane consist of

syncytiotrophoblast, cytotrophoblast, embryonic connective tissue, and endothelium of the fetal vessels

25

beneficial things that cross the placenta

metabolic gases, oxygen, carbon dioxide, water, glucose, amino acis, free fatty acids, vtamins, urea, uric acid, bilirubin, electrolytes, rBCs, serum proteins, alphafetoprotein, steroid hormones, immunogloulin A and G

26

things that cross the placental membrane that hare harmful

CO
viruses
many drugs
anti-RH antibodies
toxoplasma gondii, and treponema palladium

27

the umbillical cord has

two arteries and one vein

28

placenta accreta

placenta adheres to myometrium

29

placenta percreta

penetrates the full thickness of the myometrium and fails to seperate from the uterine wall

30

erythroblastosis fetalis

Rh incompatability between mother and fetus
mom has been exposed to fetal blood, makes antibodies IgG against fetal antigen and can cross the placenta, if there is a future pregnancy with Rh incompatability, antibodies can cross and attack fetal RBC's causing anemia and edema

31

somatic layer of extraembryonic mesoderm and layers of the trophoblast form

chorion