Neuroglia
Oligodendrocytes
Microglia
Satellite cells
Schwann cells
Astrocytes
Surround neuron cell bodies in ganglia; regulate O2, CO2, nutrient, and neurotransmitter levels around neurons in ganglia
Surround all axons in PNS; responsible for myelination of peripheral axons; participate in the repair process after injury
Myelinate CNS axons; provide a structural framework
Maintain the blood-brain barrier; provide structural support; regulate ion, nutrient, and dissolved-gas concentrations; absorb and recycle neurotransmitters from scar tissue after injury
Remove cell debris, wastes, and pathogens by phagocytosis
Line ventricles (brain) and central canal (spinal cord); assist in producing, circulating, and monitoring cerebrospinal fluid
Central Nervous System
Ependymal cells
Peripheral Nervous System