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