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Flashcards in Different Placentas Deck (14):
1

What is the name of a noninvasive shaped placenta?
What animals have this shape of placenta?

Diffuse
Sow and mare

2

What is the name of the placenta shape that uses the placentomes as the main point of contact?
What animals have this shape of placenta?

Cotyledonary
Cow and ewe

3

What is the name of a invasive shaped placenta?
Which animals have this shape of placenta?

Zonary/discoid
Bitch and queen/humans

4

What type of placenta do humans have?

Discoid

5

Ewes have a (concave/convex) placentome
Why is this different from the other type?

Concave
This kind has the chorion (fetal side) and caruncle (maternal side)

6

(T/F) Placentomes are unique to ruminants

True!

7

List the TYPES of placentas from least invasive to most invasive

Epitheliochorial
Synepitheliochorial
Endotheliochorial
Hemochorial

8

The types of placentas all end with the suffix ___

-chorial

9

(T/F) All species of livestock have a epitheliochorial type of placenta

False!
Ewes have a synepitheliochorial

10

(T/F) In some species the placenta takes over progesterone production later in gestation
If true what species?

True!
Ewe, mare, woman

11

(T/F) A peak of estrogen signals pre parturient period in some species

True!

12

(T/F) More than 70% of the total weight of the fetus at parturition is gained during the last two months of gestation

False!
50%

13

When does differentiation occur (placenta formation) for the:
Cow
Sheep
Mare
Sow

45 days
45 days
68 days
28 days

14

When is the gestation length for the:
Cow
Sheep
Mare
Sow

283 days
147 days
336 days
113 days