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Placentation, Gestation, and Parturition - Coggle Diagram
Placentation, Gestation, and Parturition
final prepartum steps of reproduction
acqusition of endocrine function of th eplacenta
initiation of parturition
immediately precedes lactation, uterine repair and return to cyclicity.
formation of a placenta
placentas have different distributions of chronic villi
chorionic villus
"exchange apparatus" and provides increased surface area so the exchange is maximized
if growth is enormous, the surface area to support placental transfer of nutrients from the dam and metallic wastes from the fetus
placental layers that separate the fetal blood from the maternal blood
nomenclature for describing placental intimacy is derived by first describing the tissues of the maternal placenta in the prefix of the word
epitheeliochorial
prefix = maternal side "epithelio"
suffix = fetal side "chorial"
has 6 layers
syndesmochorial: endometrial epithelium transiently erodes and then regrows, causing intermittent exposure of the maternal capillaries to the chorionic epithelium
binucleate giant cells
they are characterized as being quite large and have two nuclei
endotheliochorial = 5 layer
hemochorial = 3 layers
placenta regulates the exchange between the fetus and dam
simple diffusion
active transport
facilitated diffusion
second cause of dystocia is fialure of proper fetal rotation
expulsion of fetal membranes (stage III) requires myometrial contractions
placenta in major endocrine organ during preganancy
insuflucence mammary function
assists in parturition
maintain pregnancy
stimulate ovarian function
parturition is a complex cascades of physiological events
stage II: expulstion of the fetus
stage III: expulsion of the fetal membranes
stage 1: initiation of the myometrial cnntraction
fetus inititates step 1 of parturition