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Embryology > Second Week > Flashcards

Second Week Flashcards

1
Q

The trophoblast differentiates intwo what two layers and on what day?

A

The cytotrophoblast and the syncytiotrophoblast on day 8.

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2
Q

The inner cell mass differentiates into what two layers and on what day?

A

The epiblast and the hypoblast.

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3
Q

What cavity grows within the epiblast?

A

The amniotic cavity

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4
Q

What does tropho- mean?

A

Relating to nourishment

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5
Q

What does blasto- mean?

A

Relating to germination

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6
Q

What does epi- mean?

A

Above

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7
Q

What does lacuna mean?

A

Unfilled space or gap

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8
Q

What day does the lacunar stage being and where do the lacunae form?

A

Day 9 in the syncytiotrophoblast

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9
Q

The blastocyst cavity enlarges and becomes lined by hypoblast cells to form what?

A

Primitive yolk sac

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10
Q

What leads to spotting?

A

Increased blood in the lacunae

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11
Q

Cytotrophoblasts form what on Day 13?

A

Villi

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12
Q

Hypoblast cells form what on Day 13?

A

Secondary (definitive) yolk sac

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13
Q

What layer releases hormones, including human chorionic gonadotropin (hCG)?

A

Syncytiotrophoblast

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14
Q

What causes the hyatidiform mole? Also, what tissue is missing?

A

A trophoblast with only paternal genes.

Therefore, the embryonic tissue (from the mother always) is missing.

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15
Q

Implantation causes the production of what immune cells?

A

Regulatory T-cells

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16
Q

Does the fetus receive antibodies from the bother? If so, do they attack?

A

Yes, they do receive IgG antibodies.
They will not attack the fetus unless their blood mixes.

If the blood mixes, then the mother will produce antibodies to attack “foreign” blood cells (blood of fetus).

17
Q

Placenta covers what in placenta previa?

A

The internal os

18
Q

Placenta covers what in placenta accreta?

A

Placenta grows through endometrium to myometrium.

19
Q

Placenta covers what in placenta increta?

A

Placenta grows into myometrium

20
Q

Placenta covers what in placenta percreta?

A

Placenta grows into perimetrium

21
Q

What happens in placenta abruptio?

A

Placenta separates partially or totally from uterine wall

22
Q

The sinusoids and the lacuane fuse to become what and on what day?

A

Uteroplacental circulation on Day 11-12

23
Q

The splanchnic (inner) and somatic (outer) layers of the extraembryonic mesoderm form what and on what day?

A

The chorionic cavity on Day 11-12

24
Q

What do you call the filling of endometrial cells with glycogen and lipids?

A

Decidua reaction

Embryology (6 decks)

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