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*When the embryo is in it's blastula stage it has two cell layers; the epiblast and hypoblast.
 
*When the embryo is in it's blastula stage it has two cell layers; the epiblast and hypoblast.
**The epiblast is columnar whilst the hypoblast is cubiodal - each is a single cell thick.  
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**The epiblast is columnar whilst the hypoblast is cuboidal - each is a single cell thick.  
 
*'''The epiblast gives rise to all three cell layers; the hypoblast makes no contribution'''.  
 
*'''The epiblast gives rise to all three cell layers; the hypoblast makes no contribution'''.  
 
*The endoderm and mesoderm develop by proliferation and migration of cells of the epiblast.  
 
*The endoderm and mesoderm develop by proliferation and migration of cells of the epiblast.  
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