Fetal membranes, placenta, and multiple pregnancies Flashcards
Which 3 components make up blastocyst?
Trophoblast, inner cell mass, and blastocyst cavity
Which two components make up trophoblast?
syncytiotrophoblast and cytotrophoblast
When do lacunae appear in syncytiotrophoblast?
Day 10
When do lacunar networks form?
Day 12
EEM splits to form
extraembryonic coelom (chorionic cavity)
Extraembryonic somatic mesoderm lines
trophoblast and amnion
Extraembryonic splanchnic mesoderm surrounds
yolk sac
Amniotic membrane is made up of
amniotic epithelium and extraembryonic mesoderm
Chorionic membrane is made up of
extraembryonic mesoderm, cytotrophoblast, syncytiotrophoblast
Yolk sac is made up of
endoderm, extraembryonic mesoderm
The amnion contains amniotic fluid which is produced by
amniotic ectoderm, fetal respiratory tract, and fetal urine
Amniotic fluid is removed by
diffusion and swallowing by the fetus
What are the functions of the amnion?
cushions and protects, prevents adhesions, freedom of movement, controls body temp
Oligohydramnios
Disorder of amniotic fluid resulting in decreased amniotic fluid volume. Results in poor development of the lung tissue and can lead to fetal death. It can be caused by a rupture of the membranes or fetal kidney issues.
Polyhydramnios
Disorder where there is too much amniotic fluid around the baby during pregnancy. Could indicate that the fetus is having trouble swallowing or there is a GI blockage.
