myelin-, myelino- +

(Greek: lipoid substance (containing or resembling fat) sheathing certain nerve fibers; lipoid substance found in body tissue)

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.

dysmyelination
Improper laying down or breakdown of a myelin sheath of a nerve fiber, caused by abnormal myelin metabolism.
leukomyelitis
Inflammation of the white substance of the spinal cord.
myelin, myeline
A white fatty material, composed chiefly of lipids and lipoproteins, that encloses certain axons and nerve fibers.
myelinated
Having a myelin sheath; such as, a nerve fiber.
myelination, myelinization
The process by which the nerve fibers acquire myelin sheaths, which enhance the conduction of nerve impulses.
myelinic
Pertaining to or of the nature of myelin (substance of the cell membrane of large nucleated cells that coils to form the myelin sheath (cylindrical covering).
myelinoclasis
Destruction of myelin.
myelinopathy
Any disease or dysfunction of myelin.
myelinosis
Fat decomposition in which myelin is formed.
myelitis
1. Inflammation of the spinal cord, often part of a more specifically defined disease process.

One group of diseases is named according to whether primarily white matter or gray matter is affected; another group is defined by whether there is coexistent disease of the meninges (meningomyelitis) or the brain (encephalomyelitis). In practice, the term is also used to denote noninflammatory lesions of the spinal cord.
2. Inflammation of the bone marrow.

poliomyelitis
An acute infectious disease occurring sporadically or in epidemics and caused by a virus, usually a poliovirus but occasionally a coxsackievirus or echovirus.

It is characterized clinically by fever, sore throat, headache, and vomiting; often with stiffness of the neck and back.

In the minor illness (abortive poliomyelitis) these may be the only symptoms. The major illness, which may or may not be preceded by the minor illness, is characterized by involvement of the central nervous system, stiff neck, pleocytosis in the spinal fluid, and sometimes paralysis.

There may be subsequent atrophy of groups of muscles, ending in contraction and permanent deformity.