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daughter cells are still produced from neuroepithelial cells
except that when they drop to drop from the pial surface all the way to the luminal surface where they divide at the bottom parallel to the luminal surface
The significance of this is that if the cell divides perpendicular to the luminal surface both daughter cells will receive a mix of this substance called morphogens that tell them to remain neuroepithelial cells
BUT if the cell divides in the parallel plane. The top cell contains a particular mix of morphogens which tell it to attach to another neuroepithelial cell instead of the pial surface
This forms a neuroblast
Divide too much leading to an excessively large brain size (macrocephaly)
Divide too little leading to an excessively small brain size (microcephaly)