Fertilization, Cleavage and Implantation Flashcards
1
Q
Order
A
- Fertilization
- Cleavage (1-5days)
- Implantation (6-9 days)
- Gastrulation (3-4 weeks)
- Body plan (4 weeks)
- Organogenesis (4-8 weeks)
- Fetal development (8-40 weeks)
- Birth
2
Q
Fertilized egg must
A
- mitotic cell division
- instruct on cell-type
- organize cells into** tissues** and organs
- cell differenciation
3
Q
Which transcription factor do the trophoblast cells express?
A
Cdx2
4
Q
Which transcription factor do the inner cell mass cells express?
A
Oct4
5
Q
Functions of Trophoblast
A
- Implantation
- Differenetiate Chorion
- Immunosuppression
- Endocrine Gland
6
Q
What is the chorion?
A
Outermost fetal membrane around the embryo
7
Q
30% of monozygotic twins are formed at this stage
A
Cleavage stage (2-cell)
8
Q
Placental tranfer: Fetus => Mom
A
- CO2
- H2O
- urea
- uric acid
- creatinine
- bilirubin
- hormones
- RBC antigens
9
Q
Placental tranfer: Mom => Fetus
A
- O2
- H2O
- nutrients
- hormones
- antibodies
- vitamins
- drugs
- alcohol
- viruses
