Which of the following is associated with ependymal cells rather than microglial cells?

Ependymal cells line the cerebral ventricles and have blepharoplasty that are visible with special stains. They are useful histologic markers that document the ependymal origin of a brain tumor. Microglial cells are derived from macrophages and are the phagocytic cells of the central nervous system. When activated, microglial cells are called gitter cells and have a foamy appearance. Neuronophagia (e.g., viral encephalitis, poliomyelitis) occurs when microglial cells phagocytize breakdown products of the neuron. Rod-like microglial cells are seen in neurosyphilis. Macrophages are primarily responsible for carrying HIV into the central nervous system and are the reservoir cell for the virus. ref - pubmed.com