Neurons in the brain generally do not regenerate, so the blood-brain barrier has to block incoming viruses, bacteria, or other harmful material from entering the brain
Provide myelin to speed up transmission of neurons, process is myelination, also involved in maintenance and repair of myelin, only in CNS (in PNS: Schwann Cells)
Relays information from skin, limbs, joints and processes it in the brain, contains cutaneous mechanoreceptors that translate mechanical pressure from skin into neural signals