Line 81: Line 81:  
***The node then regresses posteriorly, destroying the primitive streak and forming the '''notochord''' (axial mesoderm).
 
***The node then regresses posteriorly, destroying the primitive streak and forming the '''notochord''' (axial mesoderm).
 
***The notochord begins at the level of the midbrain.
 
***The notochord begins at the level of the midbrain.
****Anterior cells are developing before posterior cells have even undergone gastrulation.
+
****Anterior cells are developing before posterior cells have undergone gastrulation.
    
==Gastrulation at the Tail Bud==
 
==Gastrulation at the Tail Bud==
1,362

edits