Downing: Placental Histology Flashcards Preview

Endo/Repro: Week 5 > Downing: Placental Histology > Flashcards

Flashcards in Downing: Placental Histology Deck (23)
Loading flashcards...
1
Q

required for for endometrial invasion by the placenta

A

secretory phase

2
Q

trophoblast proliferation (lacunar formation) >
uterine epithelium regneration>
decidual rxn

A

Endometrial invasion of the placenta

3
Q

Components of the chorionic villi

A

extraembryonic mesoderm
cytotrophoblast
syncytiotrophoblast

4
Q

1 villi

A

trophoblast only, no extraembryonic mesoderm yet

5
Q

2 villi

A

mesodermal ingrowths into villous core

branding occurs

6
Q

villi w/ cytotrophoblastic shell that invade through the syncytiotrophoblast and have direct contact w/ decidual cells

A

anchoring villi

7
Q

villus that have differentiation of blood vessels in villus core and eventual anastamosis of villar blood vessels w/ fetal circulation

A

3 villus

8
Q

where is the decidua basalis formed

A

between conceptus and myometrium

9
Q

this constitutes the MATERNAL portion of hte placenta and is the site of decidual rxna nd most extensive villar invasion

A

decidua basalis

10
Q

between the conceptus and uterine lumen

A

decidua capsularis

11
Q

decidua parietalis

A

remainder of endometrium

12
Q

Cotyledons

A

placenta divided into 15-30 lobules by septae from decidua basalis (contain 3 villi branches)

13
Q

Fetal placenta circulation

A
umbilical a>
chorionic a>
villar capillaries>
chorionic veins>
umbilical veins
14
Q

Maternal placental circulation

A

spiral arteries>
intervilous space>
endometrial veins

15
Q

How often is blood in intervillous spaces replenished?

A

3-4x/min

16
Q

first trimester placental barrier

A
syncytiotrophoblast
cytotrophoblast
basal lamina of trophoblast
fetal CT
basal lamina of fetal capillaries
fetal endothelium
17
Q

What happens to the first trimester barrier after 20 weeks?

A

cytotrophoblast disappears and CT thins and barrier is reduced to:

syncytiotrophoblast
basal laminae
fetal capillaries

18
Q

what is transferred in the placenta

A
gases
nutrients
hormones
IgG
fetal RBC (RH incompat)
urea
drugs
viruses (NO bacteria)
19
Q

origin of most placental hormones

A

syncytiotrophoblast

20
Q

LH like glyucoprotein that MAINTAINS the CL and measure ment is used to detect pregnancy

A

hCG

21
Q

related to HGH, stimualtes general growth and is lactogenic

A

Human placental lactogen

22
Q

synthesized by decidual cells

A

PRL
PG
Relaxin

23
Q

helps soften cervix and pelvic ligaments

A

relaxin