Flashcards in The Placenta Deck (31)
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1
What are the fetal membranes
chorion, amnion, yolk sac and the allantois
2
functions of the placenta
protection, nutrition, respiration, excretion and hormone production
3
the __________are part of the fetal placenta unit
suprarenal gland
4
The fetal part of the placenta arises from
chorionic sac
5
the maternal part of the placenta arises from
endometrium
6
the maternal part of the placenta is called
decidua
7
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
8
decuda basalis
deep to the fetus (base of implantation site)
9
decidua capsularis
overlying the fetus (covers the implantation site)
10
decidua parietalis
everything else (part of the decidua not implantation site or covering of it
11
what does the trophoblast give rise too ?
cytotrophoblast and syncytiotrophoboblast
12
what forms the layers of the chorion ?
somatic layer of extraembryonic mesoderm and layers of trophoblasts
13
chorionic villi will attacht to the _____ via the ____________ and serves to anchor the chorionic sac
decidua basalis, cytotrophoblast
14
what four things does the chorionic membrane consist of
syncytiotrophoblast, cytotrophoblast, embryoonic ct, and endothelium of fetal vessels
15
what does the fetal part of the placenta do ?
seperates the fetus from the endometrium of the uterus
16
what do the fetal membranes include
chorion, amnion, yolk sac, and the allantois
17
what fills the primary villi to form the secondary villi
somatic mesoderm
18
the presence of blood vessels designates what ?
tertiary villi
19
the fetal placenta is the
villous chorion
20
maternal placenta is
decidua basalis
21
where is the intervillous space derived from ?
lacunar network that formed in the syncytiotrophoblasts in the second week
22
the intervilous space is drained by what veins
endometrial veins
23
amniochorionic membrane
fusion of amniotic and chorionic sac (ruptures during labor) and membrane fuses with decidua capsularis and then adheres to decidua parietalis obliterating the uterine lumen
24
what does the placenta membrane consist of
syncytiotrophoblast, cytotrophoblast, embryonic connective tissue, and endothelium of the fetal vessels
25
beneficial things that cross the placenta
metabolic gases, oxygen, carbon dioxide, water, glucose, amino acis, free fatty acids, vtamins, urea, uric acid, bilirubin, electrolytes, rBCs, serum proteins, alphafetoprotein, steroid hormones, immunogloulin A and G
26
things that cross the placental membrane that hare harmful
CO
viruses
many drugs
anti-RH antibodies
toxoplasma gondii, and treponema palladium
27
the umbillical cord has
two arteries and one vein
28
placenta accreta
placenta adheres to myometrium
29
placenta percreta
penetrates the full thickness of the myometrium and fails to seperate from the uterine wall
30
erythroblastosis fetalis
Rh incompatability between mother and fetus
mom has been exposed to fetal blood, makes antibodies IgG against fetal antigen and can cross the placenta, if there is a future pregnancy with Rh incompatability, antibodies can cross and attack fetal RBC's causing anemia and edema
31
