Send us a Message

Submit Data |  Help |  Video Tutorials |  News |  Publications |  Download |  REST API |  Citing RGD |  Contact   


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:Primitive reflex
go back to main search page
Accession:HP:0002476 term browser browse the term
Definition:The primitive reflexes are a group of behavioural motor responses which are found in normal early development, are subsequently inhibited, but may be released from inhibition by cerebral, usually frontal, damage. They are thus part of a broader group of reflexes which reflect release phenomena, such as exaggerated stretch reflexes and extensor plantars. They do however involve more complex motor responses than such simple stretch reflexes, and are often a normal feature in the neonate or infant.
Synonyms:exact_synonym: Archaic reflex;   Primitive reflexes
 xref: UMLS:C1838319

show annotations for term's descendants           Sort by:

Term paths to the root
Path 1
Term Annotations click to browse term
  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of the nervous system 0
        Abnormal nervous system physiology 0
          Abnormality of movement 0
            Abnormal reflex 0
              Primitive reflex 0
                Glabellar reflex 0
                Grasp reflex 0
                Palmomental reflex 0
                Persistent asymmetrical tonic neck reflex 0
                Snout reflex 0
                Suck reflex 0
paths to the root