Embry 3 Flashcards

1
Q

the maternal-fetus circulation depends on ?

A
  • a fetal cardiovascular system
  • structures within the endometrium that allow exchange with the fetal cardiovascular system
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2
Q

what are the types of chorionic villi?

A
  • primary
  • secondary
  • tertiary
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3
Q

when do you see primary chorionic villi?

A

present in week 2

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4
Q

when do you see secondary chorionic villi?

A

present in week 3

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5
Q

when do you see tertiary chorionic villi?

A

present by the end of week 3

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6
Q

what are primary chorionic villi made out of?

A

only composed of cytotrophoblasts surrounded by a syncytiotrophoblastic shell

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7
Q

what are secondary chorionic villi?

A

extraembryonic mesenchymal core surrounded cytotrophoblastic and synctiotrophoblastic shell

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8
Q

what are tertiary chorionic villi?

A
  • blood vessels (capillaries) within the mesenchymal core
    fetal blood can now exchange substances between the maternal lacuna through the membrane formed by the tertiary villus
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9
Q

as the villi develop, the cytotrophoblast proliferates and extends through the synctiotrophoblast layer which forms?

A

cytotrophoblastic shell

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10
Q

what does the cytotrophoblastic shell do?

A

it anchors the chorionic sac and attaches it to the endometrium

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11
Q

what are anchoring villus?

A

a villus that attaches to the endometrium via cytotrophoblastic extensions

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12
Q

what is the decidua?

A

the endometrium in a pregnant woman

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13
Q

what are the 3 separate areas of the decidua?

A
  • decidua basalis
  • decidua capsularis
  • decidua parietalis
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14
Q

which decidua forms the placenta?

A

decidua basalis

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15
Q

how is the decidua basalis connected to the embryo

A

by the umbilical cord

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16
Q

which decidua does not include the basalis, but is still associated with/covers the embryo?

A

decidua capsularis

17
Q

which decidua is formed by the endometrium that is not part of the embryo?

A

decidua parietalis

18
Q

what is the smooth chorion?

A

the chorionic membrane that is associated with the decidua capsularis, the villi degenerate (don’t contact maternal blood)

19
Q

where is maternal blood found?

A

intervillous spaces

20
Q

what is vasculogenesis?

A

development of brand new blood vessels from mesoderm

21
Q

what is the angiogensis?

A

“sprouting” of blood vessels formed by vasculogenesis, connects blood vessels to each other

22
Q

angioblasts derived from mesoderm develop in specialized regions known as ?

A

blood islands

23
Q

what give rise to RBC?

A

angioblasts

24
Q

what is the dorsal aorta?

A

blood to the embryo and then connects to umbilical artery and cardinal veins

25
Q

what makes blood flow through the umbilical vesicle?

A

vitelline artery and vein

26
Q

what returns blood from tertiary villi back to the embryonic heart?

A

umbilical vein

27
Q

by the 4th week, the paired heart tubes have fused, resulting in?

A

a single ventricle and atrium