A disease of the brain tissue in which the myelin sheath (the fatty material wrapped around and insulating the parts of nerve cells that conduct nerve impulses in the brain to other nerve cells) deteriorates, thereby causing varying degrees of muscular dysfunction, paralysis, and muscle tremors is called:

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Multiple sclerosis is a disease in which the myelin sheath around nerve cells in the brain deteriorates, causing various symptoms such as muscle weakness, tremors, and paralysis. Muscular dystrophy is a genetic disease that causes gradual weakness and degeneration of muscle fibers. Myasthenia gravis is an autoimmune disease that causes muscle weakness and fatigue. Paraplegia is paralysis of the lower half of the body, usually caused by spinal cord injury or disease.

A Disease of the Brain Tissue in Which the Myelin