<unk>  is the thin epithelial membrane lining the ventricular system of the brain and the spinal cord.<unk>  is one of the four types of neuroglia in the central nervous system. It is involved in the production of cerebrospinal fluid (CSF).
Ependyma
Dura mater
Parenchyma
Ganglion
Arachnoid mater
Growth cone
White matter
Nucleohyaloplasm