In my clinical work, many parents often ask me: “Our baby’s MRI shows that the development of cerebral white matter myelination is backward or the development of cerebral white matter myelination is delayed or the development of cerebral white matter myelination is poor, etc.”. Today, I would like to give you a unified reply, and hope it will be helpful to you. 1.What is myelin? Myelin is a layer of membrane wrapped around the axon of a nerve cell, just like the skin of the wire we usually pick up, its role is to play an insulating role to prevent the transmission of electrical impulses from the axon of a neuron to the axon of another neuron. 2.What are the functions of myelin sheath? The first is to support electrical insulation between the axon and the surrounding tissue, such as adjacent axons, to avoid interference. The second is to speed up the transmission of action potentials through a mechanism called “jump conduction”. Third, it guides the regeneration of axons in cases where some axons are damaged. 3. What is myelination? Myelination refers to the process of myelin development, which accelerates nerve excitation conduction along nerve fibers and ensures its directional conduction. It is an essential process for the development of the nervous system in newborns. Myelination, as a way of learning, enhances the connections between cells and tissues, and the “lightness of touch” is the result of this substance. 4. What are the implications of abnormal myelination? Myelination is very common in babies with brain injury, and myelination is poorly developed, myelination is delayed, and myelination is backward. It is easy to see from the definition of myelin and the role of myelination and myelin that myelin is important to us, especially for our learning, motor function, reaction speed and so on.