Animal Development

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Animal Development

• JP Slovak

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Introduction

• Preformation
• epigenesis

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Fertilization

• Acrosomal reaction
• Fast block to polyspermy
• Cortical reaction
• Cortical granules
• Fertilization membrane
• Slow block to polyspermy

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Activation of the egg

• Increase in metabolism
• Triggered by a rise in Ca

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cleavage

• Embryo does not enlarge
• Blastomeres
• Morula
• Blastocoel develops
• blastula

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gastrulation

• Gastrula
• Ectoderm
• Endoderm
• Mesoderm
• Invagination
• Archenteron
• blastopore

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Extra embryonic membranes

• Yolk sac
• Amnion encloses developing embryo
• Chorion protection
• Allantois disposal sac

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