PSYCHOLOGY

1. DEVELOPMENTAL
PSYCHOLOGY
PRENATAL
DEVELOPMENT
GERMINAL
PERIOD

2. GERMINAL PERIOD
It extend from 1st and 2nd
week of development

3. 1ST DAY FERTILIZATION
Three layers of ovum
1.Corona radiata
2.Zona pellucida
3.Plasma membrane of
oocyte
‘ZYGOTE
FORMS’

4. AFTER 30HOURS OF FERTILIZATION
TWO – CELLED
STAGE

5. CLEAVAGE
After fertilization zygote begin
to divide mitotically and in
each division cell sized
become reduced

6. AFTER 40 HOURS OF FERTILIZATION
FOUR CELL STAGE

7. 3 TO 4 DAYS AFTER FERTILIZATION
MORULA
Morula is the solid mass of cells
[blastomers]formed by the fertilized
ovum as a result of cleavage

8. It contains,
 Inner cell
mass[embryobl
ast]
 Trophoblast
 Blastocyst[cavit
y]

9. IMPLANTATION
Implantation of blastocyst occurs in
myometrial wall of uterus

10. 9 DAYS AFTER FERTILIZATION
AFTER IMPLANTATION
Embryoblast is converted into epiblast
and hypoblast
Trophoblast is coverted into
Cytotrophoblast and syncytotrophoblast

11. GERMINAL PERIOD

12. THE BEGINNING
EMBRY
O
START
S TO
GROW