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The Human Phenotype Ontology (HPO) is downloaded weekly from The file downloaded is considered the "last stable build" available for the ontology. For more about the HPO, view their website at

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Accession:HP:0001276 term browser browse the term
Definition:A condition in which there is increased muscle tone so that arms or legs, for example, are stiff and difficult to move.
Comment:Spasticity is a term that is often used interchangeably with hypertonia. Spasticity, however, is a particular type of hypertonia in which the muscles' spasms are increased by movement. In this type, patients usually have exaggerated reflex responses.
Synonyms:exact_synonym: Hypertonicity;   Increased muscle tone
 narrow_synonym: Spasticity and rigidity of muscles
 related_synonym: Muscle hypertonia
 alt_id: HP:0002388
 xref: MSH:D009122;   SNOMEDCT_US:41581000;   SNOMEDCT_US:56731001;   UMLS:C0026826

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Path 1
Term Annotations click to browse term
  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of the musculoskeletal system 0
        Abnormality of the musculature 0
          Abnormal muscle physiology 0
            Abnormal muscle tone 0
              Hypertonia 0
                Limb hypertonia + 0
                Neck hypertonia 0
                Rigidity + 0
                Spasticity + 0
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