Final Exam Review: Placentation Flashcards Preview

Functional Histology VBMS 408 > Final Exam Review: Placentation > Flashcards

Flashcards in Final Exam Review: Placentation Deck (18):
1

Amnion

innermost fetal membrane forming a cavity; thin transparent sac that suspends the fetus; protects fetus and allows for fetal movements

2

Chorion

Outermost fetal membrane; forms from the extra embryonic coelom

3

Allantois

elongated diverticulum developing from the posterior wall of the yolk sac; fuses with chorion; serves as a reservoir for urinary waste

4

Yolk sac

transiently or poorly developed in mammals; important role in the initial stages of hematopoiesis; source of germ cells in some species

5

Discoidal

placental shape (humans, monkeys, and rodents) ; chorionic villi are formed into one or two disc shaped or oval structures (placentomes)

6

Zonary

placental shape (carnivores); chorionic villi are grouped into a region circumscribing the central third of the fetus

7

Cotyledonary

placental shape (ruminants) chorionic villi are grouped into round to oval structures (cotyledons) that interdigitate with adjacent endometrial mucosa (carnucles) to form structures called placentomes

8

Diffuse

placental shape (horses, swine); chorionic villi will cover the entire fetal surface of the placenta and are completely attached to the epithelium

9

Epitheliochorial

maternal = uterine endothelium, uterine connective tissue, uterine epithelium, fetal = chorionic epihelium, chorioallantoic connective tissue, allantoic endothelium

10

endotheliochorial

maternal = uterine endothelium, uterine connective tissue, fetal = chorionic epithelium, chorioallantoic connective tissue, allantoic endothelium

11

hemochorial

maternal = deep layers of endometrium, fetal = chorionic epithelium, chorioallantoic connective tissue, allantoic endothelium

12

Bovine Placenta

Cotyledonary villous, epitheliochorial, adeciduate

13

Deciduate

1) Variable erosion of endometrial mucosa and chorion 2) Loss of some maternal tissue at parturition

14

Delayed deciduate

1) Fetal and maternal tissues interdigitate, fuse, or lie apposed to one another
2) Minimal erosion of contributing tissue occurs

15

Adeciduate

1) Fetal and maternal tissues interdigitate, fuse, or lie apposed to one another 2) Minimal erosion of contributing tissue occurs 3) No loss of uterine mucosal tissues during parturition

16

Carnivore Placenta

Zonary labyrinthine, endotheliochorial, deciduate

17

Human Placenta

Discoidal Villous, hemochorial, deciduate

18

Equine placenta

Diffusely villous, epitheliochorial, adeciduate