Lecture 3 P 2 Flashcards
The bilaminar disk splits the environment into what two cavities
The hypoblast And epiblast
The hypoblast is facing
The blastocele
The blastocele becomes the
Primitive yolk sac
The epiblast is facing
Amniotic cavity
The amniotic cavity will eventually surround _____
The embryo
The __________ is visible within the gestational sac
Amniotic membrane
The amnoitic membrane will eventually fuse with
Chorionic walls of the gestational sac
Blastocele becomes
Primitive yolk sac
Part of the primary YS will pinch off leaving
Secondary YS
What does the YS do
Provides nourishment to the conceptus
Produces embryos first blood cells
The entire bilaminar disk is surrounded by
Trophoblastic cells
Trophoblastic cells will form the
Chorion
What does the chorion do
Will provide hCG to support corpus luteum
Will form part of the placenta
The space within the chorion is
The chorionic cavity
The chorionic cavity will be
Your visible gestational sac
As it develops the chorion projects _____ into the surrounding ________, completely surrounding the ______
Villi
Decidua
Blastocyst
The chorion will differeniate into 2 zones
Chorion leave (smooth) Chorion frondosum (villous)
On the side of the decidua capsularis the villi will degenerate leaving the
Smooth chorion aka chorion leave
On the side of the decidua basalis the villi will
Proliferate and this is villious chorion aka chorion frondosum
The chorion frondosum will become the
Embryonic portion of the placenta
The chorion frondosum will develop large _____ where ________
Intervillous spaces where maternal blood will be flooded to provide nutrients
Eventually the fetal potion of the placenta occupies
Almost all of decudua basalis, leaving only basal layer intact
The chorion frondosum and decidua basalis will form
The fetal and maternal components of the placenta
In addition to hCG, placenta begins to secrete ____ and _____ leading to the degeneration of _______-
Estrogen and progesterone
CL
For utero-placental circulation the intervillous spaces will receive blood from _____ and darined by ____
Endometrial spiral arteries
Drained by : endometrial veins which are branches of uterine veins
For feto-placental circulation (fetal aspect) how is blood supplied
The umbilical cord will develop fetal capillaries which extend i nto the terminal villi
For feto-placental circulation the umbilical cord develops until ____th week
6th
For feto-placental circulation umbilical cor contains
2 arteries (deoxygenated blood) 1 vein (oxygenated blood)
