follicle cells.
(ii) Outer thick covering is called as corona radiata.
Germinal epithelial cells
Primary Oocyte
division
(i) Secondary (ii) Polar
Oocyte body
[23 chr.]
Futher division
occurs Polar body Polar body
Mature Polar body
oocyle
or
ovum
FIG : THE PROCESS OF OOGENESIS
12.3 FERTILIZATION :
- It included release of ovum from the ovary, where it remains viable
for 12 - 24 hours.
- At the time of sexual intercourse the sperm enters in to the vagina.
- Only one sperm is required for fertilization of the ovum.
- The head of the sperm penetrates the corona radiate layer of ovum
and then the zona pellucida layer.
- This process if facilitated by acrosome and proteolytic enzymes.
- After penetration the tail and body of the sperm is lost, only head
remains inside the ovum.
- It’s head begins to swell and forms male pronucleus.
- Here the pronuclei of sperm and ovum fuse to from a new
