Ruminant And Horse Placenta Flashcards
Placenta type of ruminants
Cotyledonary
Type of fusion and number of layers for ruminant placenta
Epitheliochorial fusion
Six layers
Type of ruminant cell is large and has two nuclei?
Binucleate giant cells
Where do binucleate giant cells originate from?
Fetal trophoblast cells
What days for cattle and sheep do binucleate giant cells form?
Day 14 sheep
Day 18 to 20 cattle
Binucleate giant cells are the site of ______
Steroidogenesis
Estrogen and progesterone
What two molecules do binucleate giant cells transfer?
Pregnancy specific protein B
Placental lactogen
Placenta type and number of layers for horses
Cotyledonary
Epitheliochorial fusion-6 layers
Placenta of horses produces what gonadotropin?
Equine chorionic gonadotropin
Or pregnant mares serum
What produces equine chorionic gonadotropin?
Endometrial cups after conceptus attaches to uterine endometrium
eCG functions
Sustains primary corpus luteum
Forms accessory corpus lutea (grow and ovulate follicles)
— between days 40 and 70 of pregnancy
Placenta in humans produces
Human chorionic gonadotropin
hCG functions
Sustains corpus luteum during pregnancy
Placenta of humans assumes progesterone production after
2.5 months
Progesterone functions during pregnancy
Causes secretion of histotrophe
Progesterone block reduces myometrial contractions
