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Embryology > 2nd week of development > Flashcards

2nd week of development Flashcards

1
Q

2 layers of inner cell mass

A

Hypoblast and Epiblast

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2
Q

Cuboidal cells of ICM

A

Hypoblast

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3
Q

Columnar cells of ICM

A

Epiblast

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4
Q

Amnion or amniotic cavity is formed by

A

Epiblast

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5
Q

External layer of Amniotic cavity is

A

EEM - Somatic or parietal layer

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6
Q

Inner layer of Amniotic cavity is

A

Amniogenic cells

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7
Q

Dorsal aspect of inner cell mass

A

Epiblast

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8
Q

Ventral aspect of ICM

A

Hypoblast

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9
Q

Heuser’s membrane

A

Hypoblast

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10
Q

Exocoelomic membrane is

A

Hypoblast

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11
Q

Primary YS is formed by

A

Hypoblast + Flattened squamous cells.

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12
Q

Lining of primary YS

A

Flattened squamous cells.

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13
Q

Double Bleb sign on USG is seen in

A

2nd week of Development

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14
Q

What are the Double Bleb’s on USG

A

Primary YS and Amniotic cavity.

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15
Q

2 layers of OCM

A

Cytotrophoblast and Syncytiotrophoblast.

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16
Q

Extra embryonic mesoderm is present btw

A

Cytotrophoblast and Inner cell mass

17
Q

Layer btw Cytotrophoblast and Inner cell mass is

18
Q

EEM is formed by

A

Primary yolk sac

19
Q

Hormone factory

A

Syncytiotrophoblast.

20
Q

When can HCG be first detected

A

on the first day of missed period / 8-9 days after fertilisation.

21
Q

Low HCG is seen in

A

Ectopic or Missed abortion.

22
Q

High HCG is seen in

A

Molar pregnancy and Multiple pregnancy.

23
Q

Cytotrophoblast ____ nucleated and ____defined membrane

A

Single and Well defined.

24
Q

Syncytiotrophoblast is _____ nucleated and ____defined membrane

A

Multi and Not well defined.

25
Q

Primary Chorionic villi is formed by

A

Cyto and syncytiotrophoblast.

26
Q

Secondary Chorionic villi is formed by

A

Somatic EEM and Cyto and Syncytiotrophoblast.

27
Q

Chorion is formed by

A

EEM + Cyto + Syncytio

28
Q

Lacunae is formed in which layer

29
Q

Uteroplacental Circulation is established by

30
Q

Feto- Placental circulation is established by

31
Q

1st system to develop.

32
Q

when does primary YS turn into Secondary YS

A

on being surrounded by Splanchnopleuric EEM

33
Q

Cavitation of EEM result in

A

Formation on Somatic or parietal and Splanchnic layer of EEM.

34
Q

Connecting stalk

A

undivided part of EEM.

35
Q

Connecting stalk forms

36
Q

Umbilicus is formed by

A

Connecting stalk.

Embryology (16 decks)

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