<prompt> What is the lining epithelium of ventricles of brain?EpendymaCiliated columnar cellsNon Ciliated columnar cellsSquamous epithelium  <response>: Ans. is a i.e., Ependyma b i.e., Ciliated columnar cells Ependymae Ependyma is the thin epithelial lining of the ventricular system of the brain and the central canal of the spinal cord, made up of ependymal cells. Ependymal cells are ciliated simple columnar cells. Ependyma is one of the four types of neuroglia in the central nervous system CNS. It is involved in the production of cerebrospinal fluid CSF, and is shown to serve as a reservoir for neuroregeneration. The basal membranes of these cells are characterized by tentacle-like extensions that attach to astrocytes. 