Final answer:
Schwann cells in the peripheral nervous system form the myelin sheath around axons, while oligodendrocytes in the central nervous system myelinate multiple axons.
Explanation:
Schwann cells are the glial cells in the peripheral nervous system responsible for forming the myelin sheath around axons. Unlike oligodendrocytes in the central nervous system, which myelinate multiple axons, a single Schwann cell provides myelin for only one axon by wrapping around it entirely.
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