Module 5- OB Intro Flashcards
Timelines of the trimesters
1st: 0 days-12w6d
2nd: 13 weeks- 27w6d
3rd: 28 weeks- 40 weeks
What bloodwork happens and when?
1st: PAPPA and hCG
16 weeks: triple and quad screen
24-28 weeks: glucose tolerance screen
When is it called and embryo and when is it called a fetus?
After 10 weeks the embryo becomes the fetus
What is the purpose of the zona pellucida?
Prevents other sperm from getting into the egg
What is the purpose of the corona radiata?
Provides nutrients to the ovum
Where does fertilization occur in the female pelvis?
Ampullar portion of the Fallopian tubes
When is implantation complete by?
11-12 days post ovulation/9-10 days post fertilization
Syncytiotrophoblast produces what?
hCG
Which is the more external one, which is more internal?:
-syncytiotrophoblast
-cytotrophoblast
Syncytiotrophoblast- external
Cytotrophoblast- internal
What is the early placenta?
Chorion frondosum (which is part of the cytotrophoblast)
Describe the decidua layers of the uterus (3)
- Decidua basalis- underlying the conceptus and becomes the maternal side of the placenta
- Decidua capsularis- covers over the gestational sac
- Decidua parietalis(Vera)- all remaining decidua
Describe the 3 layers of the trilaminar disc
- Endoderm: inner (linings GI and respiratory tract)
- Ectoderm: outer (forms CNS and surface of the ectoderm- hair, skin, teeth, nails)
- Mesoderm: middle (forms muscle and bone)
When is the yolk sac seen on ultrasound?
From 5 weeks to about 10-12 weeks
What is the upper limit of normal for the yolk sac before 10 weeks?
6mm
How much does the gestational sac grow per day?
1.1mm/day
