Pregnancy Flashcards
What is placentation?
development of extra embryonic membranes or placenta
_____ - development of extra embryonic membranes or placenta
Placentation
In placentation fertilized ovum migrates ____ days after fertilization, the ovum then moves to _____
6; one of the uterine horns
Development of the placenta is slow, it takes about _____ to complete
150 days
Early in pregnancy a yolk sac is formed which then becomes the _____
placenta
Early in pregnancy a _____ is formed which then becomes the placenta
yolk sac
How many membranes are in the fetal placenta? What are they?
3; chorion, allantois, amnion
What is the chorion?
Outer membrane covered with villi
____ - outer membrane covered with villi
chorion
What is the allantois?
second membrane lines the inside of the chorion
_____ - second membrane lines the inside of the chorion
allantois
What is the amnion?
inner membrane fused with the allantois, forms a “water bag” or allantoic cavity
_____ - inner membrane fused with the allantois, forms a “water bag” or allantoic cavity
amnion
Allantoic cavity fills with more fluid than the _____
amniotic cavity
Where are umbilical arteries and veins located? What does is carry?
In the connective tissue between allantois and chorion; carries unoxygenated blood and waste from fetus to mare
Blood of the fetus does not mix with _____
maternal blood
About day 36 of pregnancy the _____ invade the endometrium, these cells multiply and become _____
chorionic girdle cells; endometrial cups
Cup cells secrete _____ (_____), stimulates E2 production from CL
eCG (equine chorionic gonadotropin)
Endometrial cups are most active from day _____ of pregnancy
55-65
By day _____ the cups are sloughed off due to an immune response by the mare
120-150
