Final answer:
Oligodendrocytes produce myelin sheath in the CNS while Schwann cells produce myelin sheath in the PNS.
Explanation:
Oligodendrocytes produce the myelin sheath in the central nervous system (CNS) that surrounds many axons in the brain and spinal cord. On the other hand, Schwann cells produce myelin sheath in the peripheral nervous system (PNS) that surrounds many axons.
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