1. OOGENESIS
DR.SHABANA ALI

2. FEMALE REPRODUCTIVE SYSTEM

3. INTRAUTERINE LIFE
2nd wk..yolk sac
5th wk…gonades
3rd_5thmonth
..mitosis
7thmonth..
degeneration
40,000 at birth
500 ovulation,
One oocyte is released in each cycle

4. Primary follicle Secondary follicle
INTRAUTERINE LIFE
Primordial follicle
meiosis I
(prophase)arrest
AT PUBERTY
Monthly ovarian cycle
Primary follicle Secondary follicle
Secondary oocyte,
One polar body.
(ovulation)if fertilization occur
mature ovum,polar bodies
Resume
Meiosis one complete
2nd meiosis
Metaphase arrest
Meiosis 2 completes

6. Ist meiotic divison till prophase .Complets Ist meiotic division
Intrauterine life
Primordial follicle
At puberty
Primary follicle
Secondary follicle
Primary oocytes
Secondary oocyte
Ist meiotic divison till prophase
.Complets Ist meiotic division
.Starts 2nd meiotic division till metaphase

7. Every month,15-20 follicles are selected and they mature in three stages
1.primary/preantral
2.secondary/antral-longest
3.preovulatory-37 hrs before ovulation

8. INTRAUTERINE LIFE

9. PRIMORDIAL FOLLICLE
1.Primary oocyte
2.flat cell layer

10. PRIMARY FOLLICLE 1.granulosa cells..stratfied cuboidal cells
2.zona pellucida..Acelluler,glyco protein layer,impermeable
3.theca folliculi…theca externa and interna

11. SECONDARY FOLLICLE 1.Antrum 2.cumulus oophorus 3.size-increased
4.25mm in size

12. CORPUS LUTEUM 1.cell number increased 2.vascularity increased
3.size… more than 25mm

13. CORPUS ATRETICUM 1.cell number decreased 2.vascularity decreased
3.degeneration

14. CORPUS ALBICAN
1.Fatty degeneration of cells
2.Fibrous tissue

18. Gonadotropins, Hormones, and the Ovarian and Uterine Cycles

19. Pituitary-Ovarian Axis

20. oogenesis