title: Nasal valve: anatomy and physiology.
abstract: The anterior portion of the nasal cavities, from the nostril to the nasal valve (NV), is the place of highest nasal resistance to airflow, paramount to nasal physiology. There are different terminologies for the same anatomic structures in the literature.
  
  
  OBJECTIVE
  The aim of this paper was to study the NV function and define clearly the structures of the anterior portion of the nasal cavities, mainly the region of the NV.
  
  
  CONCLUSIONS
  Internum ostium is the anterior segment and isthmus nasi is the posterior segment of the NV region.
authors: Otorhinolaryngology - Faculdade de Medicina de Taubaté, UNITAU. carlos@otorrinoclinica.com.br
authors: Carlos Eduardo Nazareth
authors: CE
authors: Nigro
authors: Josiane Faria de Aguiar
authors: JF
authors: Nigro
authors: Olavo
authors: O
authors: Mion
authors: João Ferreira
authors: JF
authors: Mello
mesh_terms: D006801:Humans; D009296:Nasal Cavity / Q000033:anatomy & histology* / Q000502:physiology*; D009297:Nasal Mucosa / Q000502:physiology; D015508:Nasal Obstruction / Q000175:diagnosis*; D025363:Rhinomanometry; D023842:Rhinometry, Acoustic