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OB > Lecture 3A - Embryology > Flashcards

Lecture 3A - Embryology Flashcards

1
Q

morula is how many cells and is the same size as

A

12-15, zygote

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2
Q

implantation is what day after conception and what day LMP

A

day 5,

20-23 LMP

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3
Q

3 layers of blastocyst/blastula

A

trophoblast
ICM/embryoblast
blastocele

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4
Q

what produces hCG for the CL?

A

trophoblast

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5
Q

what layer of the blastocyst/blastula is the future embryo

A

ICM/embryoblast

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6
Q

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

A

blastocele

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7
Q

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

A

bilaminar embryonic disc

amniotic sac/cavity

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8
Q

what is the bilaminar embryonic disc comprised of (2)

A

epiblast

hypoblast

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9
Q

primitive ectoderm

A

epiblast

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10
Q

primitive endoderm

A

hypoblast

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11
Q

the “endometrium” of pregnancy

A

decidua

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12
Q

what is the future embryo

A

blastocyst

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13
Q

what develops into the placenta?

A

chorion

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14
Q

what provides nutrients to developing fetus

A

yolk sac

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15
Q

what is gastrulation?

A

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

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16
Q

what is the early gestational sac?

A

the chorionic cavity

17
Q

decidua layers (3)

A

decidua basalis/decidual plate
decidua capsularis
decidua parietalis/vera

18
Q

what is the site of blastocyst attachment?

A

decidua basalis/decidual plate

19
Q

what is the maternal placenta?

A

decidua basalis (decidual plate)

20
Q

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

A

decidua capsularis

21
Q

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

A

decidua parietalis/vera

22
Q

the visible gestation sac is the

A

chorionic cavity

23
Q

the trophoblastic cells surround what? and becomes what?

A

surrounds the bilaminar disk, becomes the chorion

24
Q

chorion leave (smooth) is on the side of

A

decidua capsularis

25
Q

chorion frondosum (villous) is on the side of

A

decidua basilis

26
Q

placental circulation involves

A 
2 arteries (deoxygenated)
1 vein (oxygenated)
27
Q

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

A

endoderm (from hypoblast)

28
Q

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

A

ectoderm (from epiblast)

29
Q

what does the mesoderm layer form (4)

A

MSK, kidneys, gonads, circulatory

30
Q

what does the amniotic sac fuse with

31
Q

what does the amion surround?

A

epiblast layer

OB (20 decks)

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