What wraps cytoplasmic extensions around thick neuron fibers in the CNS?

In the central nervous system (CNS), oligodendrocytes are the cells responsible for wrapping cytoplasmic extensions around thick neuron fibers. These extensions form myelin sheaths, which insulate the axons and enhance the speed of electrical signal transmission. Each oligodendrocyte can myelinate multiple axons, contributing to the efficiency of neural communication within the CNS.