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Schwann cells are the supporting cells of the PNS. Like oligodendrocytes schwann cells wrap themselves around nerve axons, but the difference is that a single schwann cell makes up a single segment of an axon's myelin sheath.
Schwannomas are benign tumors of the nerve sheath that grow slowly and push nerve fibers aside. They occur most often as solitary tumor but on occasion as multiple lesions. Schwannomas can arise from any peripheral nerve containing Schwann cells, including cranial nerves.