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Repro Phys > Embryonic Development And Placentation > Flashcards

Embryonic Development And Placentation Flashcards

1
Q

Three layers of blastocyst (day 14)

A 
Ectoderm
   CNS, hair, hooves
Mesoderm
    Skeletal system, kidney, muscle
Endoderm
    Digestive system, pancreas, liver
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2
Q

4 placental membranes

A

Yolk sac

Amnion

Allantois

Chorion

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3
Q

Chorion

A

Attaches to uterus, produces hormones, absorbs nutrients

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4
Q

Allantois

A

Fused with chorion, carries blood vessels

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5
Q

Amnion

A

Protects fetus, lubrication during parturition

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6
Q

Yolk sac

A

Early nutrient supply

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7
Q

Two types of implantation

A

Superficial - chorion fuses to uterine endometrium

Interstitial - embryo invades and develops in endometrium

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8
Q

Four main placental types

A

Diffuse (mare/sow) - villi cover surface of chorion

Zonary (dogs/cats) - villi form a band around chorion

Cotyledonary (cow/ewe) - villi localized at cotyledons

Discoidal (primates) - villi cover 1/2 placental surface

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9
Q

Cow place ration

A

30-35 days

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10
Q

Sow placentation

A

12-20 days

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11
Q

Ewe placentation

A

18-20 days

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12
Q

Mare placentation

A

50-60 days

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13
Q

Human placentation

A

8-10 days

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14
Q

Cat placentation

A

12-14 days

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15
Q

Dog placentation

A

16-18 days

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16
Q

Epithelialchorial fusion

A

6 layers

Pigs
Horses
Ruminants

17
Q

Endothelialchorial fusion

A

5 layers

Dogs and cat

18
Q

Hemochorial fusion

A

3 layers

Primates
Rodents

19
Q

Blastocyst 4 parts

Day 6

A

Inner cell mass
Zona pellucida
Trophoblast
Blastocoele

20
Q

Main function of placenta

A

Provide fetal nutrition

21
Q

Details placental function

A

Blood gas exchange at chorion
Converts glucose to fructose
Highly permeable to water and electrolytes

22
Q

Each individual cell is called

A

Blastomere

23
Q

Embryo enters uterus around day

A

4-5

24
Q

What is a morula?

A

Embryo with Over 32 cells

25
Q

Maternal recognition of pregnancy

A

Prostaglandin F 2 alpha is inhibited

Corpus luteum is protected from PGF2a

Repro Phys (10 decks)

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