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Urology And Reproductive Systems SF5 > Embryonic Development > Flashcards

Embryonic Development Flashcards

1
Q

Name the cells made during the 2nd division

A

Blastomeres

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2
Q

What is the 3rd stage of division called

A

Morula (cluster of cells)

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3
Q

What do outer blastomeres differentiate into

A

Trophoblasts

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4
Q

What occurs after the blastocysts is formed

A

Zona pellucida pressure increases and ruptures

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5
Q

How does the placenta form

A

Extra embryonic membrane form in order to attach to endometrium

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6
Q

What is the function of the placenta

A

Feral nourishment
Protection
Hormone production

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7
Q

What germ layer forms the yolk sac

A

Endoderm

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8
Q

Which membrane layer develops after the yolk sac

A

Mesoderm

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9
Q

What is the chorion layer

A

Trophoblasts and mesodermal layer fuse

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10
Q

What is the allanotois

A

Liquid waste

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11
Q

What type of placenta do pigs have

A

Diffuse

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12
Q

At type of placenta do carnivores have

A

Zonary

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13
Q

What type of placenta do primates and rodents have

A

Discoid

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14
Q

What type of placenta do horses and ruminants have

A

Cotelydonary (placentone based)

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15
Q

Name the specific placenta type in a mare

A

A diffuse Microcotyladonary

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16
Q

What produces progesterone

A

Corpus luteum

17
Q

What causes uterine contractions

A

Oestrodiol

18
Q

How is the endometrial cup formed

A

Chorionionic girdle (trophoblasts that invaded the endometrium)

19
Q

How are placenta classified

A

Distribution of villi
How many layers

20
Q

What are the 3 layers in a foetus

A

Chorion (epithelial)
Basement membrane
Chorionic capillary blood supply

21
Q

What is a haemochorial placenta

A

Foetus gets nutrients from maternal directly blood supply as is bathed in maternal blood

22
Q

What is the epithelioochorial placenta

A

Doesn’t invade material endometrium

23
Q

What is an endothelialchorial

A

Endothelial wall of mother separates it from the foetus

24
Q

How does the mare recognise pregnancy

A

The embryo (concepts) migrates around the uterus to distribute pregnancy factors

25
Q

what occurs to the oocyte after fertilisation

A

cytoplasm binds to sperm
releases corticol granules (makes layer that stops sperm from breaking through)
sperm nuclear membrane broken down in order to release genetic material
cause meiosis forming 2nd polar body
oocyte becomes ootid

Urology And Reproductive Systems SF5 (15 decks)

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