a physical condition in which there is a disturbance of normal functioning

loss of the myelin covering of some nerve fibers resulting in their impaired function

any degenerative disorder resulting from inadequate or faulty nutrition

a chronic progressive nervous disorder involving loss of myelin sheath around certain nerve fibers

a degenerative disorder of the central nervous system characterized by tremor and impaired muscular coordination

any of several degenerative nervous disorders characterized by spasmodic movements of the body and limbs