Different Placentas

Question 1

What is the name of a noninvasive shaped placenta?

What animals have this shape of placenta?

Answer 1

Diffuse

Sow and mare

Question 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?

Answer 2

Cotyledonary

Cow and ewe

Question 3

What is the name of a invasive shaped placenta?

Which animals have this shape of placenta?

Answer 3

Zonary/discoid

Bitch and queen/humans

Question 4

What type of placenta do humans have?

Answer 4

Discoid

Question 5

Ewes have a (concave/convex) placentome

Why is this different from the other type?

Answer 5

Concave

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

Question 6

(T/F) Placentomes are unique to ruminants

Answer 6

True!

Question 7

List the TYPES of placentas from least invasive to most invasive

Answer 7

Epitheliochorial
Synepitheliochorial
Endotheliochorial
Hemochorial

Question 8

The types of placentas all end with the suffix ___

Answer 8

-chorial

Question 9

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

Answer 9

False!

Ewes have a synepitheliochorial

Question 10

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

Answer 10

True!

Ewe, mare, woman

Question 11

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

Answer 11

True!

Question 12

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

Answer 12

False!

50%

Question 13

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

Answer 13

45 days
45 days
68 days
28 days

Question 14

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

Answer 14

283 days
147 days
336 days
113 days