Which type of neuroglia forms the myelin sheath around nerves outside the brain and spinal cord?

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Schwann cells form the myelin sheath around nerves outside the brain and spinal cord, while oligodendrocytes form the myelin sheath around nerves in the brain and spinal cord. Ependymal cells line the ventricles of the brain and produce cerebrospinal fluid, and astrocytes provide support and nourishment to neurons.

Which Type of Neuroglia Forms the Myelin Sheath Around Nerves