Development of Ependymal and Postnatal Neural Stem Cells and Their Origin from a Common Embryonic Progenitor

？ Numbers of cells in the lateral ventricle wall decrease despite ventricle growth ？ Ependymal cells expand apical surface area to accommodate larger ventricle size ？ Apical ependymal expansion and clustering of stem cells results in pinwheel formation ？ Ependymal and adult neural stem cells share common embryonic progenitor