Chick development
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The document describes the structure and early development of a fertilized egg. It shows that a fertilized egg contains a zygote surrounded by membranes and air sacs within the egg shell. The zygote undergoes cleavage to form a blastoderm with multiple blastomeres. Gastrulation then occurs as the blastoderm elongates and forms three germinal layers - the epiblast, hypoblast and mesoderm. This establishes the basis for further organ development in the early embryo.
Chick development
- 1. Fertilized Egg āLaidā = Zygote shell membrane Chalaza Air sac Egg shell Zygote
- 2. Structure of Fertilized Egg Zygote Air sac Chataza shell Egg shell membrane
- 3. Cleavage in Chick Embryo Cleavage 1 Cleavage 2 Zygote Two Blastomeres four Blastomeres Cleavage 3,4,5 Area Opaca Sixteen Blastomeres Area Pellucida Blastoderm
- 4. Gastrulation in Chick Yolk Blastoderm elogated Blastodisc or Blastoderm blastocoel epiblast hypoblast
- 6. From Gastrula to Neurula
- 7. Three Germinal Layers in Chick Embryo Yolk sac Yolk