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HUMAN PHENOTYPE - ANNOTATIONS

The Human Phenotype Ontology (HPO) is downloaded weekly from http://compbio.charite.de/hudson/job/hpo/lastStableBuild/artifact/ontology/release/hp.obo. The file downloaded is considered the "last stable build" available for the ontology. For more about the HPO, view their website at http://www.human-phenotype-ontology.org/.
Term:Upper motor neuron dysfunction
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Accession:HP:0002493 term browser browse the term
Definition:A functional anomaly of the upper motor neuron. The upper motor neurons are neurons of the primary motor cortex which project to the brainstem and spinal chord via the corticonuclear, corticobulbar and corticospinal (pyramidal) tracts. They are involved in control of voluntary movements. Dysfunction leads to weakness, impairment of fine motor movements, spasticity, hyperreflexia and abnormal pyramidal signs.
Comment:A functional deficit of the tract that conveys nervous impulses from the motor cortex of the brain to the spinal cord. The corticospinal tract mediates discrete voluntary skilled movements. Clinical features of corticospinal tract dysfunction may include spasticity and weakness, particularly affecting the lower limbs, as well as hyperreflexia, clonus at the ankles and knees, and extensor plantar responses (Babinski response).
Synonyms:exact_synonym: Corticospinal tract dysfunction;   Pyramidal tract dysfunction
 xref: UMLS:C1504405;   UMLS:C1839042


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  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of the nervous system 0
        Abnormal nervous system physiology 0
          Abnormal central motor function 0
            Upper motor neuron dysfunction 0
              Abnormal pyramidal sign + 0
              Dysfunction of lateral corticospinal tracts 0
              Spasticity + 0
              Weakness due to upper motor neuron dysfunction + 0
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