Gonad Development Flashcards
1
Q
When does indifferent stage of gonads take place?
A
4-7 weeks
2
Q
Indifferent gonads develop in what?
A
Urogenital ridge (гребень)
3
Q
The components of Urogenital ridge are?
A
- primordial germ cells
- primary sex cords
- mesonephric (Wolffian, male) and paramesonephric (Mullerian, female) ducts
4
Q
Development of testis and male reproductive system is directed by what?
A
- Sri gene (Y chromosome, encodes testis-determining factor)
- Testosterone (by Leydig cells)
- Mullerian inhibiting factor (by Sertoli cells)
- Dihydrotestosterone (DHT): external henitalia
5
Q
If there are no factors the fetus will be
A
female
6
Q
When does spermatogenesis begin?
A
After puberty
7
Q
When does oogenesis begin?
A
On week 4
8
Q
What happens when female reach puberty?
A
Every month Primary oocyte (arrested in P phase of meiosis 1) develops in Secondary Oocyte (arrested in M phase of meiosis 2) which is ovulated
9
Q
What happens to Secondary oocyte after fertilization?
A
It completes meiosis 2 and forms mature oocyte and polar body
10
Q
When are all of the primary oocytes formed?
A
On 5th month of fetal life
