#degenerative_disorder  condition leading to progressive loss of function
  supertype:  #disorder.state__upset  condition in which there is a disturbance of normal functioning; "the doctor prescribed some medicine for the disorder"; "everyone gets stomach upsets from time to time"
  subtype:  #demyelination  loss of the myelin covering of some nerve fibers resulting in their impaired function
  subtype:  #dystrophy  any degenerative disorder resulting from inadequate or faulty nutrition
     subtype:  #osteodystrophy  defective bone development; usually attributable to renal disease or to disturbances in calcium and phosphorus metabolism
  subtype:  #disseminated_multiple_sclerosis__multiple_sclerosis__MS__disseminated_sclerosis  a chronic progressive nervous disorder involving loss of myelin sheath around certain nerve fibers
  subtype:  #paralysis_agitans__paralysisagitan__Parkinsonism__Parkinson's_disease__Parkinson's_syndrome__Parkinson's__shaking_palsy__shakingpalsy  a degenerative disorder of the central nervous system characterized by tremor and impaired muscular coordination
  subtype:  #chorea  any of several degenerative nervous disorders characterized by spasmodic movements of the body and limbs
     subtype:  #orthochorea  a form of chorea in which spasms occur mainly when the patient is erect
     subtype:  #Sydenham's_chorea__Saint_Vitus_dance__St._Vitus_dance  chorea occurring chiefly in children and associated with rheumatic fever
     subtype:  #tarantism  a nervous disorder characterized by an uncontrollable impulse to dance; popularly attributed to bite of the S European tarantula or wolf spider
     subtype:  #Huntington's_chorea__Huntington's_disease  hereditary; develops in adulthood and ends in dementia

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