lect 16 and 17- placenta and fetus Flashcards
what is the decidua basalts between
blastocyst and myometrium
what is the cap of the implantation site
decidua capsularis
what is the maternal blood color
dull red
what gives the placenta its shaggy look
remnants of decidua basalts
what is the fetal part of the placenta
villous chorion
what is the primary stage of formation of the villous chorion
projection of trophoblast
what is the secondary stage of formation of the villous chorion
mesoderm core
what is the tertiary stage of formation of the villous chorion
formation of capillaries in villus
when is the capillary system of the placenta membrane established
when the heart begins to beat
what separates the lateral and fetal blood
hemochorial placenta
what erodes the spiral arteries
cytotrophoblast
describe the maternal placental circulation
spiral arteries to intervillous spaces to uterine veins
describe fetal placental circulation
1 umbilical vein picks of oxygenated blood and returns via 2 umbilical arteries to chorionic umbilical arteries to chorionic arteries to capillary beds in villi
what occurs when the placenta covers the internal os
placenta previa
what occurs when the placenta grows through the endometrium to the myometrium
placenta accreta
what occurs when the placenta grows into the myometrium
placenta increta
what occurs when the placenta grows into the perimetrium
placenta percreta
what occurs when the placenta separates partially or totally from uterine wall
placenta abruptio
what occurs when one twin compresses the second twin against the uterus
fetus papyraceus
what do conjoined twins share
amnion, chorion and placenta
what is stage one of parturition
effacement and dilation of the cervix
what is stage 2 of parturition
delivery of the fetus
what is stage 3 of parturition
delivery of the placenta and fetal membranes
describe the growth of fetal length
increases linearly
what ultrasound measurement is used to help determine size and probability of age in a fetus
crown rump length
how long are external genitalia similar between males and females
until end of week 9
when do the external genitalia of fetuses real mature form
week 12
when are intestinal coils visible in the proximal end of the umbilical cord
until middle of week 10
when do intestines return to the abdomen
by the end of week 10
what is the major site of erythropoiesis at week 9
liver
what is the main erythropoietic organ at week 12
spleen
when does urine formation begin
between week 9 and 12
when does limb movement become coordinated
week 14
what is the skin of the fetus covered in weeks 17 to 20
vernix caseosa
what is the mixture of dead epidermal cells and secretion from sebaceous glands
vernix caseosa
when are eyebrows and hair visible
at 20 weeks
when does surfactant production begin
week 24
when do eyelids open
week 26
when are toenails visible
week 26-29
when is the pupillary light reflex present
30 weeks
what are some conditions that decrease uterine blood flow
small chorionic vessels, severe hypotension/hypertension, renal disease, decrease maternal placental circulation
when do taste buds and swallowing appear
taste buds at week 7; swallowing week 10
what is the fetal component of the placenta derived from
trophoblast and extra embryonic mesoderm
what is the maternal component of the placenta derived from
uterine endometrium
what membrane ruptures during labor (water breaking)
amniochorionic membrane
what is the placenta bordered by on the fetal side
chorionic plate
what is the placenta bordered by on the maternal side
decidua basalis
when does splitting of the zygote in monozygotic twins typically occur
at the early blastocyst stage
what is he major growth promoting factor during development before and after birth
IGF-1
what condition is characterized by maternal hypertension and proteinuria due to reduced organ perfusion
preeclampsia
what occurs when anemia becomes so severe that edema and effusions into the body cavities occurs, leading to fetal death
fetal hydrops
