MOKA CHARITHA ROLL NO:10 FIRST YEAR BHMS ASR HOMEOPATHIC MEDICAL COLLEGE AND HOSPITAL

1. OOGENESIS
By- MOKA CHARITHA

2. DEFINITION
Location: ovarian cortex
Process of formation of mature
ovum from primordial germ cells.

3. Process of oogenesis:3 stages
1.Before birth
2. After puberty
3.After fertilisation

4. Before 3rd month of IUL: PGC’S undergo mitosis to form
oogonia.
Before7th month of IUL: oogonia multiply mitotically to form
primary oocytes and surrounding by epithelial cells.
7 th month - birth :primary oocytes complete prophase I of
meiotic division and arrested at dictyotene ( diplotene ) stage by
oocyte maturation inhibitor factor till puberty
From birth to puberty follicles are in dormant stage.

6. After puberty:
● Primary oocytes undergo maturation and increase in size.
● When the surrounding falt cells converted into cuboid cells it is called
as primary follicle.
● Follicular cells multiply to form multilayered granulosa layer then this
follicle is called secondary follicle.
● When fluid filled cavity ( follicular antrum) appears in the follicular
cells it is called as teritary follicle.
● Tertiary follicle is called matured graffian follicle when it is surrounded
by stromal cells which are condensed to form :
1) Outer fibrous layer-theca externa
2) Inner vascular layer-theca interna

7. Continuation..
Accumulated amorphous glycoprotein
forms a layer bw the primary oocytes and
follicular cells ZONA PELLUCIDA
Graffian follicle ovulates secondary oocyte.

10. After fertilisation
● If ovum is fertilized secondary oocyte completes second
meiotic division.
● During second meiosis secondary oocyte pushes second
polar body into perivitalline space.
● If fertilization does not occur secondary oocyte does not
under go meiotic division and under go degeneration in 24
hrs.
● After fertilisation graffian follicle forms into corpus luteum.

11. Dr.B.srinivas
Associate professor
Department of anatomy
Under ther guidance of:

12. THANK YOU