Oogenesis

1. Oogenesis

2. Oogenesis
• Development of ovum (oogenesis)
• Maturation of follicle
• Fate of ovum and follicle

4. Oogenesis
• Site – ovary
• Duration – 7th week of embryo –primordial germ cells
• -3rd month of fetus –oogonium
• - two million primary oocyte
• -7th month of fetus primary oocyte +primary follicle
• - at birth primary oocyte with prophase of
• 1st meiotic division
• - 40 thousand primary oocyte in adult ovary
• - 500 primary oocyte attain maturity
• - oogenesis completed after fertilization

5. Development of ovum
Oogonium(44XX)
-In fetal ovary
Primary oocyte (44XX)
arrest till puberty in
prophase of 1st phase
meiotic division
Secondary oocyte(22X)+Polar
body(22X)
1st phase meiotic division
completed at ovulation
&enter in 2nd phase
Ovum(22X)+polarbody(22X)
After fertilization

7. Dr NavneetKumar Professor

9. Maturation of follicle

10. Maturation of follicle
Primordial follicle
-Follicular cells
Primary follicle
-Zona pallucida
-Granulosa cells
Secondary follicle
Antrum developed
Ovarian /Graafian follicle
- Theca interna &externa
-Membrana granulosa
-Antrial cavity
-Discus proligerus
-Cumulus oophoricus

13. Ovulation

14. Structure of ovum
• Secondary oocyte
• Vitellus
• Nucleus
-phase of 2ed meiotic division
• Vitelline membrane
• Previtelline space
1st polor body
• Zona pellucida
• Corona radiata

16. Fate of ovarian follicle
Formation of Corpus
luteum
• After ovulation ovarian
follicle Ruptured and
folded
Corpus luteum
• Follicular
cells/granulosa cells
-Cells of membrana
granulosa
-lutien pigment
• Luteal cells
• Theacal cells

18. Corpus luteum
• Corpus luteum of pregnancy
• Corpus luteum of menstruation

19. Fate of follicle

20. Fate of follicle
• Corpus luteum
-Corpus albicans
• Corpora atretica
-interstitial gland