Neuronal structure reflects neuronal function. Microglia are macrophages that become phagocytic upon injury to nervous system. They migrate into the developing nervous system. Macroglia Astrocytes are star-shaped cells characterized by a special class of intermediate filaments and terminal expansions of cell processes that adhere to blood vessels. Protoplasmic Astrocytes are found in grey matter and they have more cytoplasm and fewer intermediate filaments.
Oligodendroglia are glial cells found in both white and grey matter.
Ependymal Cells are epithelial cells lining the ventricles of the brain and the spinal canal. Their apical surface is ciliated. Sustentacular cells , which play a supportive function within encapsulated sensory receptors. Unlike the situation in an organ like the liver, damage to a small portion of the CNS can result in the complete loss of certain functions. The CNS is a soft, delicate tissue easily susceptible to damage.