Final answer:
In the central nervous system (CNS), the oligodendrocyte is the myelin-forming glia. Oligodendrocytes produce the myelin sheath that insulates axons in the CNS and can provide myelin for multiple axon segments.
Step-by-step explanation:
In the central nervous system (CNS), the myelin-forming glia is the oligodendrocyte. Oligodendrocytes are glial cells that insulate axons in the CNS by producing the myelin sheath. They have processes that extend from the cell body and surround axons to provide insulation. Each oligodendrocyte can provide myelin for multiple axon segments.