Fertilization + Implantation Flashcards
What day does fertilization occur and where
approx day 14, ampulla of fallopian tube
What is the zona reaction
When the sperm makes the zona pellucida impermeable to other sperm
A zygotes next cell stage is
Morula
A morula’s next cell stage is
Blastocyst
Blastocyst is broken down into
Embryoblast and trophoblast
Embryoblast eventually becomes the
embryo
Trophoblast eventually becomes the
Placenta
Embryoblast and trophoblast are AKA
Inner and outer cell masses
The amniotic cavity forms within which cell on what day?
Inner cell/embryoblast, day 22
The embryo completely implants into the endometrium on what day
23
The primary yolk sac forms on what day
23/24
Maternal-placental circulation is established on what day
23/24
Chorionic cavity forms on what day
25/26
Secondary yolk sac is formed on what day
26/27
Bilaminar embryonic disc appears on what day
28/29 (4 weeks)
Once fertilization occurs, the endometrium is termed ____
decidualized
What are the 3 layers of decidua
Basalis, capsularis, parietalis
Describe decidua basalis
point of deepest attachment, forms the placenta
Describe decidua capsularis
Decidua that surrounds the blastocyst
Describe decidua parietalis/vera
on the opposite side of uterine cavity/implant site
The chorionic villi that are the conceptus’ contribution to the placenta are called
Chorionic frondosum
bHCG is produced by
syncytiotrophoblasts
bHCG preserves the ____ and keep _____ levels high to prevent menstruation
CLC, progesterone
bHCG levels should roughly ______ every 48hrs in a normal pregancy
double
