1) Degenerative disorder 1) Demyelinization 
Loss of myelin with preservation of the axons or fibre tracts. Central demyelination occurs within the central nervous system (e.g., the demyelination seen with multiple sclerosis); peripheral demyelination affects the peripheral nervous system (e.g., the demyelination seen with Guillain-Barre syndrome). ... (05 Mar 2000) ... 
(de-mi″ә-lĭn-a´shәn) destruction, removal, or loss of the myelin sheath of a nerve or nerves. Called also demyelinization and myelinolysis.
Type: Term Pronunciation: dē-mī′e-lin-ā′shŭn, dē-mī′ĕ-lin-i-za′shŭn Definitions: 1. Loss of myelin with preservation of the axons or fiber tracts. Central demyelination occurs within the central nervous system (the demyelination seen with multiple sclerosis); peripheral demyelination a...
Demyelination: A degenerative process that erodes away the myelin sheath that normally protects nerve fibers. Demyelination exposes these fibers and appears to cause problems in nerve impulse conduction that may affect many physical systems. Demyelinization is seen in a number of diseases, particularly multiple sclerosis. Diagnosis is by functional...
[n] - loss of the myelin covering of some nerve fibers resulting in their impaired function
demyelination, demyelinization Loss of myelin with preservation of the axons or fiber tracts. Central demyelination occurs within the central nervous system (for example, the demyelination seen with multiple sclerosis); peripheral demyelination affects the peripheral nervous system.
noun loss of the myelin covering of some nerve fibers resulting in their impaired function
loss of myelin from the nerve sheaths, as in multiple sclerosis.