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Placentation Gestation and Parturiton - Coggle Diagram
Placentation Gestation and Parturiton
final prepartum steps of reproduction are
acquisition of endocrine function of the placenta
initiation of parturition
fomation of a placenta
terms
placenta: organ of metabolic interchange between the conceptus and the dam
parturition: is the step in the reproductive process that immediately precedes lactation, uterine repair and return to cyclicity
implantation: attachment of the placental membranes to the endometrium in most animals
placentas have different distributions of chronic villi
chronic villus: the function al unit of the fetal placenta, is an "exchange apparatus" and provides increased surface are so that exchange is maximized
placentas are classified according to the distribution of chronic villi
diffuse
zonary
discoid
cotyledonary
diffuse placentas have uniform distribution of chronic villi that cover the surface of the chorion
microcotyledons: mare placenta is also classified as diffused "microzones" of chronic villi
endometrial cups: discrete areas that range from a few millimeteres to several centimeters in diameter
equine chronic gonadotropin (eCG)
zonary placentas have a band-like zone of chronic villi
paraplacenta: important in iron transport from the dam to the fetus
discoid placentas from a regionalized disc
is found in rodents and primates
characterized by having one or two distinct adjacent disc contains chronic villi that interface with the endometrium and provide the region for gas, nutrient and metabolic waste exchange
cotyledonary placentas have numerous, discrete button-like structures called cotyledons