Astrocytes: abundant, versatile, highly branched. They cling to neurons, synaptic ending & capillaries. Function: support neurons, play role in exchange of capillaries & neurons; guide migration; control chem environment; respond to nerve impulses & neurotransmitters ; influence neuronal functioning & info processing.Microglial Cells: small, avoid cells thorny processes than touch & motor neurons; migrate toward injured neurons, transform phagocytize & neuronal debri. Ependymal Cells: squamous to columnar; ciliated circulate csf; line central cavities brain & spine; form barrier between csf & CNS cells. Oligodendrocytes: -branched, processes wrap; CNS nerve fibers, forming myelin sheaths in thick nerve fibers