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==Gastrulation at the Primitive Streak==
 
==Gastrulation at the Primitive Streak==
 
*The epiblast is a simple circular plate of cells.
 
*The epiblast is a simple circular plate of cells.
*Cells proliferate and through migration, converge at one pole of the epiblast. These cells become columnar to compensate for the decreased amount of space available.  
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*Cells proliferate and converge through migration, at one pole of the epiblast. These cells become columnar to compensate for the decreased amount of space available.  
 
**This defines the posterior of the embryo.
 
**This defines the posterior of the embryo.
 
*Eventually, convergence causes cells to be displaced anteriorly. As more cells converge, the primitive streak elongates.   
 
*Eventually, convergence causes cells to be displaced anteriorly. As more cells converge, the primitive streak elongates.   
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