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Flashcards in The second week Deck (23):
1

What are the two parts of the blastocyst ?

embryoblast and the trophoblast

2

What are the two parts of the embryoblast

hypoblast and the epiblast

3

what are the two parts of the trophoblast

cytotrophoblast and the syncytiotrophoblast

4

at the end of the second week what are the two cavities that are formed

amnionic cavity and the yolk sac

5

the layer of the hypoblast is now called______________ and the cavity is now called the ______________-.

extraembryonic endoderm, primary yolk sac

6

What is the lining of he embryoblast called ?

heuser's membrane

7

What is secreted between the extraembryonic endoderm and the cytotrophoblast ?

extraembryonic reticulum

8

what are the two layers of the extraembryonic mesoderm

somatopleuric if contact with trophoblast and splanchnopleuric if contact with the embryo

9

what does the connecting stalk become

unbilical cord

10

what does the syncytiotrophoblast secrete

HcG

11

what happens on day 9?

the uteronplacental circulation begins to form trophoblastic lacunae and the maternal sinusoids

12

what is the chroion composed of ?

cytotrophoblasts, synctiotrophoblasts and extraembryonic mesoderm

13

what does a hydatidiform mole result from ?

fertilization of an empty oocyte, typicaly secretes high levels of HcG

14

what does polyhydramnios mean ?

too much amnionic gluid, could be the result from a GI problem

15

what does oligohydramnios mean

too little amnionic fluid and could be suffering from a kidney problem

16

what are the layers materials must transverse if exchanging materials from mother to fetus

synctiotrophoblast, cytotrophoblast, loos CT of the villlus and endothelium of the villus capilarries

17

what is a complete mole ?

fertilization of an empty oocyte with duplication, or fertilization of an empty oocyte by two sperms

18

What is placental previa

Implantation in the internal os of the uterus near cervix that causes significant bleeding

19

what are partial moles

result from a poorly developed embryo and are always triploid or XXX, XXY, or XYY

20

somatopleuric

lines the cytotrophoblast and helps from the chorion

21

splanchnopleuric

contact with germ disc and contributes to the umbilical cord; the laer around the yolk sac and amnion cease to develop further and are unimportant

22

what is the chorion composed of

somatopleuric layer, cytotrophoblast, syncytiotrophoblast

23

neuroenteric canal

connection between the amniotic cavity and the yolk sac