Lecture 3A - Embryology

Question 1

morula is how many cells and is the same size as

Answer 1

12-15, zygote

Question 2

implantation is what day after conception and what day LMP

Answer 2

day 5,

20-23 LMP

Question 3

3 layers of blastocyst/blastula

Answer 3

trophoblast
ICM/embryoblast
blastocele

Question 4

what produces hCG for the CL?

Answer 4

trophoblast

Question 5

what layer of the blastocyst/blastula is the future embryo

Answer 5

ICM/embryoblast

Question 6

what layer of the blastocyst/blastula is the future primitive yolk sac

Answer 6

blastocele

Question 7

what does the ICM/embryoblast develop into? (2)

Answer 7

bilaminar embryonic disc

amniotic sac/cavity

Question 8

what is the bilaminar embryonic disc comprised of (2)

Answer 8

epiblast

hypoblast

Question 9

primitive ectoderm

Answer 9

epiblast

Question 10

primitive endoderm

Answer 10

hypoblast

Question 11

the “endometrium” of pregnancy

Answer 11

decidua

Question 12

what is the future embryo

Answer 12

blastocyst

Question 13

what develops into the placenta?

Answer 13

chorion

Question 14

what provides nutrients to developing fetus

Answer 14

yolk sac

Question 15

what is gastrulation?

Answer 15

2 layer bilaminar disk develops into 3 layer gastrula (endoderm, mesoderm, ectoderm)

Question 16

what is the early gestational sac?

Answer 16

the chorionic cavity

Question 17

decidua layers (3)

Answer 17

decidua basalis/decidual plate
decidua capsularis
decidua parietalis/vera

Question 18

what is the site of blastocyst attachment?

Answer 18

decidua basalis/decidual plate

Question 19

what is the maternal placenta?

Answer 19

decidua basalis (decidual plate)

Question 20

what is the layer of decidua opposite to blasto attachment that separates from endo?

Answer 20

decidua capsularis

Question 21

what is the layer of decidua / endo not in contact with blastocyst

Answer 21

decidua parietalis/vera

Question 22

the visible gestation sac is the

Answer 22

chorionic cavity

Question 23

the trophoblastic cells surround what? and becomes what?

Answer 23

surrounds the bilaminar disk, becomes the chorion

Question 24

chorion leave (smooth) is on the side of

Answer 24

decidua capsularis

Question 25

chorion frondosum (villous) is on the side of

Answer 25

decidua basilis

Question 26

placental circulation involves

Answer 26

``` 2 arteries (deoxygenated) 1 vein (oxygenated) ```

Question 27

the lungs/GI/bladder (visceral structures) form from what layer from gastrulation

Answer 27

endoderm (from hypoblast)

Question 28

nair, nails, epidermis, nervous system forms from what layer from gastrulation

Answer 28

ectoderm (from epiblast)

Question 29

what does the mesoderm layer form (4)

Answer 29

MSK, kidneys, gonads, circulatory

Question 30

what does the amniotic sac fuse with

Answer 30

chorion

Question 31

what does the amion surround?

Answer 31

epiblast layer