#muscle_spasm__spasm__cramp  a painful and involuntary muscular contraction
  supertype:  #symptom  (medical) any sensation or change in bodily function that is experienced by a patient and is associated with a particular disease
  subtype:  #charleyhorse  (colloquial) a muscular cramp (especially in the thigh or calf) following vigorous exercise
  subtype:  #writer's_cramp__graphospasm  muscular spasms of thumb and forefinger while writing with a pen or pencil
  subtype:  #blepharospasm  spasm of the eyelid muscle resulting in closure of the eye
  subtype:  #crick__rick__wrick  a painful muscle spasm especially in the neck or back (`rick' and `wrick' are British)
  subtype:  #myoclonus__myoclonu  a clonic spasm of a muscle or muscle group
  subtype:  #opisthotonos  severe spasm in which the back arches and the head bends back and heels flex toward the back
  subtype:  #twitch__twitching__vellication  a sudden spasm; especially one caused by a nervous condition
     subtype:  #tic  a local and habitual twitching especially in the face
     subtype:  #blepharism  condition in which a person blinks continuously
     subtype:  #fibrillation.twitch  muscular twitching involving individual muscle fibers acting without coordination
        subtype:  #atrial_fibrillation  fibrillation of the muscles of the atria of the heart
        subtype:  #ventricular_fibrillation__ventricularfibrillation  fibrillation of heart muscles resulting in interference with rhythmic contractions of the ventricles and possibly leading to cardiac arrest
     subtype:  #fasciculation  muscular twitching of contiguous groups of muscle fibers
  subtype:  #tenesmus  painful spasm of the anal sphincter along with an urgent desire to defecate without the significant production of feces; associated with irritable bowel syndrome
  subtype:  #trismus__trismu  prolonged spasm of the jaw muscles

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