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Unformatted text preview: * cells from animal pole move down over yolk-rich cells and invaginate, forming dorsal lip of the blastopore * yolk-filled cells fill the space enclosed by the lips of the blastopore, forming yolk plug * Blastocoel disintegrates, archenteron forms Gastrulation in Frogs 3 (Fig 50-9) Gastrulation in Birds 4 (Fig 50-10) Learning Objective 8 * Define organogenesis * Summarize the fate of each of the germ layers Organogenesis 1 * Gastrulation leads to organogenesis: * The process of organ formation * Ectoderm becomes * nervous system * sense organs * outer layer of skin (epidermis) Organogenesis 2 * Mesoderm becomes * notochord * skeleton * muscles * circulatory system * excretory and reproductive * inner layer of skin (dermis) * Endoderm becomes lining of the digestive tube * Including liver, pancreas and lungs...
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- Spring '10
- Developmental Biology, germ layers, Amphioxus