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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

Term:Aplasia/Hypoplasia involving the central nervous system
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Accession:HP:0002977 term browser browse the term
Definition:Absence or underdevelopment of tissue in the central nervous system.
Synonyms:exact_synonym: Absent/underdeveloped central nervous system tissue;   Aplasia/Hypoplasia involving the CNS
 alt_id: HP:0001323
 xref: UMLS:C4025665

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  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of the nervous system 0
        Abnormal nervous system morphology 0
          Morphological central nervous system abnormality 0
            Aplasia/Hypoplasia involving the central nervous system 0
              Agenesis of pineal gland 0
              Aplasia/Hypoplasia involving the corticospinal tracts + 0
              Aplasia/Hypoplasia of the brainstem + 0
              Aplasia/Hypoplasia of the cerebellum + 0
              Aplasia/Hypoplasia of the cerebrum + 0
              Aplasia/Hypoplasia of the optic tract + 0
              Aplasia/Hypoplasia of the pyramidal tract + 0
              Atrophy/Degeneration affecting the cerebrum + 0
              Global brain atrophy 0
              Hypoplasia of olfactory tract 0
              Hypoplasia of the olfactory bulb 0
              Hypoplasia of the pons + 0
              Hypoplasia of the ventral pons 0
              Hypoplastic olfactory lobes 0
              Optic nerve hypoplasia + 0
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