1. Fertilized Egg “Laid” = Zygote shell membrane Egg shell Air sac Zygote Chalaza

2. Structure of Fertilized Egg Zygote Chataza Air sac shell membrane Egg shell

3. Cleavage in Chick Embryo Cleavage 1 Cleavage 2 Cleavage 3,4,5 Sixteen Blastomeres four Blastomeres Two Blastomeres Area Opaca Area Pellucida Blastoderm Zygote

4. Gastrulation in Chick Yolk Blastodisc or Blastoderm Blastoderm elogated epiblast blastocoel hypoblast

5. Gastrulation in Frog

6. From Gastrula to Neurula

7. Three Germinal Layers in Chick Embryo Yolk Yolk sac