Question: are all peripheral nerves myelinated?
Answer: Schwann cells make myelin in the peripheral nervous system (PNS: nerves) and oligodendrocytes in the central nervous system (CNS: brain and spinal cord). In the PNS, one Schwann cell forms a single myelin sheath (Figure 1A). ... Are all axons covered with myelin? No; they can be either myelinated or unmyelinated.