The Placenta Flashcards
What are the fetal membranes
chorion, amnion, yolk sac and the allantois
functions of the placenta
protection, nutrition, respiration, excretion and hormone production
the __________are part of the fetal placenta unit
suprarenal gland
The fetal part of the placenta arises from
chorionic sac
the maternal part of the placenta arises from
endometrium
the maternal part of the placenta is called
decidua
What is the decidua reaction ?
with increasing levels of progesterone, the connective tissue cells of the decidua become enlarged and pale staining and help protect the uterus against complete invasion of the synctiotrophoblast
decuda basalis
deep to the fetus (base of implantation site)
decidua capsularis
overlying the fetus (covers the implantation site)
decidua parietalis
everything else (part of the decidua not implantation site or covering of it
what does the trophoblast give rise too ?
cytotrophoblast and syncytiotrophoboblast
what forms the layers of the chorion ?
somatic layer of extraembryonic mesoderm and layers of trophoblasts
chorionic villi will attacht to the _____ via the ____________ and serves to anchor the chorionic sac
decidua basalis, cytotrophoblast
what four things does the chorionic membrane consist of
syncytiotrophoblast, cytotrophoblast, embryoonic ct, and endothelium of fetal vessels
what does the fetal part of the placenta do ?
seperates the fetus from the endometrium of the uterus