How are the paranasal sinuses structured?

Updated: Mar 01, 2018
  • Author: Itzhak Brook, MD, MSc; Chief Editor: Michael Stuart Bronze, MD  more...
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Answer

The paranasal sinuses are air-filled bony cavities that extend from the skull base to the alveolar process and laterally from the nasal cavity to the inferomedial aspect of the orbit and the zygoma. The sinus cavities are lined with pseudostratified, ciliated, columnar epithelium that is contiguous, via ostia, with the lining of the nasal cavity. This epithelium contains a number of mucus-producing goblet cells. These goblet cells in the epithelium and the submucosal seromucous glands contribute to the airway surface liquid, [7] which is 5-100 μm thick and covers the epithelium.


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