Brain and Behavior

Brain Development

What role does myelination play?

Myelin is a fatty sheath that covers the surface of axon fibers and acts as a kind of insulation. Myelination increases the speed at which the action potential travels down the axon. The myelination of axon fibers is not well developed at birth. Myelination continues throughout childhood and myelination of the frontal lobe is not complete until the third decade of life.


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