formation of blastula. gastrulation early gastrula ectoderm: blue; dorsal lip of blastopore: green...
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Formation of blastula
Gastrulation
Early gastrulaectoderm: blue; dorsal lip of blastopore: greenendoderm: yellow; yolk: orange
Mid-gastrulaBlue: ectoderm; Green: chordomesodermRed: mesoderm (ventral lip); Yellow: endoderm
Late gastrula (yolk plug stage)Green: notochordYellow: endoderm lining the archenteron
Formation of neural plate and early neurulation
Neural tube stage and late neurula
3-4 mm frog embryoFormation of brain vescicles:
prosencephalonmesencephalonrhombencephalon
In situ hybridization
Steps in the activationof a receptor tyrosinekinase:
Neural Induction
Mechanical factors which may contribute toNeurulation:
Cadherins and cell adhesion
Example of Cell-CellRecognition viaCadherins:
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