Obs Flashcards
If PGCs deviate from normal path and reach the neck, they form
Oropharyngeal teratoma
If PGCs deviate from normal path and reach the coccyx, they form
Sacrococcygeal teratoma
Why do PGCs form teratomas?
Bcz they’re pleuripotent cells
Pleuri potent cells
Ability to form all three germ layers
Totipotent cells
Ability to form all 3 germ layers + extra embryonic tissue
In the 8 Cell- embryo stage, all cells are totipotent
Cells forming the blood testis barrier
Sertoli cells
Time taken for spermatogenesis
74 days
Time taken for spermiogenesis
10-14 days
Vagina & cervix act as reservoir for sperm for how many days resp
2 hours &
3 days
The arrested state of primary oocyte is called
(Also, the stage absent in spermatogenesis is) :
Dictyate state
Meconium production occurs at
16 weeks
Fetal urine production occurs at
12 weeks (can start from 8 weeks)
Fetal movements occur at
7 weeks (not the same as quickening)
Fetal lung maturity tests
- Lecithin sphingomyelin ratio
- Phosphatidyl glycerol in AF
- Shake test/ bubble/ Clement test
- Nile blue sulphate test with skin cells (PL+= orange cells)
- Phosphatidyl choline test
- Optical density test.
Fetal and maternal sides of placenta are formed from
Chorion frondosum
Decidua basalis
