title: [The applied anatomy and measure of nasolacrimal duct].
abstract: OBJECTIVE
  To know the anatomy of nasolacrimal duct.
  
  
  METHODS
  80 half-skulls of chinese adult were used to observe shapes of the orifice.
  
  
  RESULTS
  Five shapes of the orifice were found. Slit-shape was the most in all shapes. 73 nasolacrimal ducts and situation of orifices have been measured with results as follows: (1) The nasolacrimal duct length is 14.14 mm (mean value); (2) The distance from the inferior margin of the anterior nostril to the anterior margin of the orifice (D.N.O.) is 29.00 mm (mean value); (3) The distance from the anterior attachment of the inferior turbinate to the anterior margin of the orifice is 11.70 mm (mean value); (4) The distance from the inferior margin of the anterior nostril to the anterior attachment of the inferior turbinate (D.N.T) is 18.30 mm (mean value). With analysis of linear regression, the relationship between the "D.N.T." and the nasolacrimal duct length, the "D.N.T." and the "D.N.O." is positive linear correlation respectively, "D.N.T." has been able to be measured easily, so the nasolacrimal duct length and the situation of the orifice have been recognized.
  
  
  CONCLUSIONS
  D.N.T. may be used in clinical teaching and researching work.
authors.affiliation: Department of Otorhinolaryngology, General Hospital, Tianjin Medical University, Tianjing 300052.
authors.forename: C
authors.initials: C
authors.lastname: Ni
authors.forename: H
authors.initials: H
authors.lastname: Li
authors.forename: C
authors.initials: C
authors.lastname: Li
authors.forename: M
authors.initials: M
authors.lastname: Lu
mesh_terms: D000328:Adult; D000718:Anatomy, Regional; D044466:Asian People; D001344:Autopsy; D002681:China; D005260:Female; D006801:Humans; D008297:Male; D009296:Nasal Cavity / Q000033:anatomy & histology; D009301:Nasolacrimal Duct / Q000033:anatomy & histology*