Placentation

Question 1

Placental Types - Chorionic Villi:
Chorionic villi uniformly distributed across entire surface of chorion

Answer 1

Diffuse

Question 2

Placental Types - Chorionic Villi:
Formation of specific zone of chorionic villi

Answer 2

Zonary

Question 3

Placental Types - Chorionic Villi:
Discrete, disc-like zone

Answer 3

Discoid (common in primates)

Question 4

Placental Types - Chorionic Villi:
“Button-like” structure

Answer 4

Cotyledonary

Question 5

The Sow and the Mare are examples of what type of placentation?

Answer 5

Diffuse

Question 6

What species have epitheliochorial?

Answer 6

Sow, Mares, Ruminants

Question 7

What “layer is not present” in Endotheliochorial?

Answer 7

Endometrial epithelium

Question 8

What species have Endotheliochorial?

Answer 8

Dogs and Cats

Question 9

What species have Hemochorial?

Answer 9

Primates and rodents

Question 10

What is left in Hemochorial?

Answer 10

Chorionic epithelium
Chorionic interstitium
Chorionic capillaries

Question 11

Name the layers that separate fetal and maternal blood:

Answer 11

Maternal endothelium
Maternal interstitium
Maternal epithelium
Fetal epithelium (trophoblasts)
Fetal interstitium
Fetal endothelium

Question 12

Match the species with the placental type:
Zonary

Answer 12

Canines and Felines

Question 13

Match the species with the placental type:
Cotyledonary

Answer 13

Ruminants
- Cattle, Sheep and Goats

Question 14

Match the following with the placental type:
Single zone for placental exchange

Answer 14

Discoid

Question 15

What placentation distribution corresponds to a species that Implants into the endometrium?

Answer 15

Discoid

Question 16

What structure contains fluid that the fetus directly swallows and inhales in utero?

Answer 16

Amniotic cavity

Question 17

Match the following with the placental type:
Chorionic villi are distributed evenly across the endometrium

Answer 17

Diffuse

Question 18

Which species has an Epitheliochorial?

Answer 18

Mares

Question 19

Which species has a Synepitheliochorial or Syndesmochorial?

Answer 19

Ruminant

Question 20

Which species has Endotheliochorial?

Answer 20

Felines and Canines

Question 21

Which species has Hemochorial?

Answer 21

Primates and rodents

Question 22

What materials can cross the placental barrier?

Answer 22

• Vitamins
• Glucose
• Small molecular weight hormones
• Some toxic materials
• Some microorganisms
• Some teratogenic materials

Question 23

(T/F) Fetal stress initiates a cascade of events of parturition

Answer 23

True

Question 24

What is the function of the following hormone?
ACTH

Answer 24

initiates parturition cascade of events

Question 25

What is the function of the following hormone? Estradiol

Answer 25

increased secretion of mucus

Question 26

What is the function of the following hormone? Oxytocin

Answer 26

secretion stimulated by increased pressure on cervix by fetus

Question 27

What is the function of the following hormone? Prostaglandin F2alpha

Answer 27

Promotes secretion of relaxin

Question 28

Hormones from the placenta have which functions?

Answer 28

- Stimulate ovarian function - Maintain pregnancy - Stimulate fetal growth - Stimulate mammary function - Facilitate parturition

Question 29

Maternal Hemorrhage and necrosis

Answer 29

pigmented zone

Question 30

Microcotyledons

Answer 30

mare

Question 31

Glycogen plaques

Answer 31

cotyledonary placenta

Question 32

live birth

Answer 32

vivparous

Question 33

egg laying

Answer 33

oviparous

Question 34

Organ of fetal exchange of nutrients and metabolic wastes

Answer 34

Placenta

Question 35

Blastocyst embeds in endometrium before placental development

Answer 35

implantation

Question 36

mammals with a placenta

Answer 36

Eutherian

Question 37

Semipermanent relationship between fetal extraembryonic membranes and maternal placenta

Answer 37

attachment

Question 38

Can be detected in blood and urine at 8-10 days of gestation

Answer 38

hCG

Question 39

Promotes fetal growth and stimulates mammary function

Answer 39

placental lactogen

Question 40

PSBP

Answer 40

Binucleate giant cells

Question 41

Helps stretch pelvic ligaments

Answer 41

relaxin

Question 42

How many layers does the Endotheliochorial placenta have?

Answer 42

Five layers

Question 43

How many layers does the Epitheliochorial placenta have?

Answer 43

Six layers