Sinonasal Anatomy
general

NASAL VESTIBULE

  • entrance to the nasal cavity
  • lined by skin
  • ends posteriorly at limen nasi, the junction of the lower and upper lateral cartilage
  • medial wall is the mobile columella, formed by the medial wing of the alar cartilage and the caudal portion of the cartilaginous septum
  • the floor is < 1 cm in length.

NASAL CAVITY

  • begins at limen nasi
  • ends at posterior nasal apertures or choanae
  • from hard palate to base of skull (sphenoid sinus, cribriform plate, and frontal sinus)
  • lateral border is the perpendicular plate of the ethmoid and pterygopalatine fossa.

MAXILLARY SINUS

  • single pyramidal cavity
  • medial: nasal cavity
  • roof: orbital (ethmoid sinus)
  • anterolateral: facial
  • posterolateral: infratemporal
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