Final answer:
Ependymal cells are glial cells in the central nervous system (CNS) responsible for producing cerebrospinal fluid (CSF) and are a crucial component of the CNS's support system.
Step-by-step explanation:
Ependymal cells are a type of glial cell found within the central nervous system (CNS). These cells line the ventricles in the brain and are responsible for producing cerebrospinal fluid (CSF), which circulates throughout the CNS. The production of CSF by ependymal cells occurs at the choroid plexus, a structure where these cells come into contact with blood vessels and filter blood to produce this essential fluid. Ependymal cells play a critical role in maintaining the brain's extracellular environment and are considered as part of the CNS’s support system, along with astrocytes, oligodendrocytes, and microglia.