The second week

Question 1

What are the two parts of the blastocyst ?

Answer 1

embryoblast and the trophoblast

Question 2

What are the two parts of the embryoblast

Answer 2

hypoblast and the epiblast

Question 3

what are the two parts of the trophoblast

Answer 3

cytotrophoblast and the syncytiotrophoblast

Question 4

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

Answer 4

amnionic cavity and the yolk sac

Question 5

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

Answer 5

extraembryonic endoderm, primary yolk sac

Question 6

What is the lining of he embryoblast called ?

Answer 6

heuser’s membrane

Question 7

What is secreted between the extraembryonic endoderm and the cytotrophoblast ?

Answer 7

extraembryonic reticulum

Question 8

what are the two layers of the extraembryonic mesoderm

Answer 8

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

Question 9

what does the connecting stalk become

Answer 9

unbilical cord

Question 10

what does the syncytiotrophoblast secrete

Answer 10

HcG

Question 11

what happens on day 9?

Answer 11

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

Question 12

what is the chroion composed of ?

Answer 12

cytotrophoblasts, synctiotrophoblasts and extraembryonic mesoderm

Question 13

what does a hydatidiform mole result from ?

Answer 13

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

Question 14

what does polyhydramnios mean ?

Answer 14

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

Question 15

what does oligohydramnios mean

Answer 15

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

Question 16

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

Answer 16

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

Question 17

what is a complete mole ?

Answer 17

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

Question 18

What is placental previa

Answer 18

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

Question 19

what are partial moles

Answer 19

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

Question 20

somatopleuric

Answer 20

lines the cytotrophoblast and helps from the chorion

Question 21

splanchnopleuric

Answer 21

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

Question 22

what is the chorion composed of

Answer 22

somatopleuric layer, cytotrophoblast, syncytiotrophoblast

Question 23

neuroenteric canal

Answer 23

connection between the amniotic cavity and the yolk sac