Axons are covered with an insulating material called a myelin sheath.

Name: Axons are covered with an insulating material called a myelin sheath.
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Axons are indeed covered with a myelin sheath, which is formed by specialized cells called Schwann cells in the peripheral nervous system and oligodendrocytes in the central nervous system. The myelin sheath helps to increase the speed and efficiency of nerve transmission by allowing electrical signals to travel more quickly down the axon.

Axons Are Covered with an Insulating Material Called a Myelin