This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroanatomy, Subject name: Anatomy
What is the lining epithelium of ventricles of brain? 
Select and explain. 
A. Ependyma, B. Ciliated columnar cells, C. Non Ciliated columnar cells, D. Squamous epithelium
A: Ependyma
Answer: A: Ependyma 
Explanation: 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.