Pyriform aperture

Anterior view of skull – pyriform aperture is highlighted
Click on image for an enlarged view
  • Pyriform aperture is the anterior most and narrowest area of the bony part of nose
  • Boundaries of pyriform aperture:
    • Superior – Nasal bone
    • Lateral – Frontal (nasal) process of maxilla
    • Inferior – Premaxilla, anterior nasal spine of maxilla
  • Clinical importance:
    • Congenital Nasal Pyriform Aperture Stenosis
      • stenosis of pyriform aperture resulting in significantly increased nasal airway resistance

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CNPAS – Acronym

CNPAS stands for: Congenital Nasal Pyriform Aperture Stenosis

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