PRESENTED BY :MRS.M.S.PATEL

2. And eventually form a Morula

3. Next it becomes a blastula

5. Trophoblast

6. 6
Implantation
• begins about the 6th day of
development
• trophoblast will help form the
placenta
• trophoblast secretes hCG which
helps maintain the pregnancy

7. Layers of inner cell mass

8. Differentiation of Primary Germ Layers
(from the gastrula)
Ectoderm Mesoder
m
Endoder
m
Nervous
system
Skeleton Digestive
tract
Epidermis
of skin
Muscles Respirator
y system
Circulator
y system
Liver,
pancreas
Gonads Bladder