The invention relates to an ependymal neural CNS stem cell, which cell expresses the surface protein Notch 1 together with at least one surface protein chosen from the group of Notch 2, Notch 3, CAR (transmembrane protein binding adenovirus) and CFTR cystic fibrosis transmembrane conductance regulator), and which cell also comprises at least one cilium. The invention also relates to preparations, including pharmaceutical preparations, comprising ependymal neural CNS stem cells, in vitro and in vivo assays based thereon and various other uses of the novel ependymal cells according to the invention.