Paranasal sinuses

Your paranasal sinuses are small hollow spaces around the nose. They are lined with cells that make mucus, which keeps your nose from drying out. The nasal cavity is the passageway just behind your nose. Air passes through it on the way to your throat as you breathe.

NIH: National Cancer Institute

Source: MedLinePlus (NIH)1

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Paranasal Sinuses: Air-filled spaces located within the bones around the Nasal Cavity. They are extensions of the nasal cavity and lined by the ciliated Nasal Mucosa. Each sinus is named for the cranial bone in which it is located, such as the Ethmoid Sinus; the Frontal Sinus; the Maxillary Sinus; and the Sphenoid Sinus.2

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Paranasal Sinus: An air-filled cavity adjacent to the nasal cavity lined by a mucous membrane and located in the bones of the skull. There are four paranasal sinuses on each side of the face: ethmoid, frontal, maxillary, and sphenoid sinus.3


Types may include:4

Types of Paranasal Sinus:

Categories for Paranasal sinuses

Category of Paranasal Sinus:


Anatomy Articles

Read about these related anatomy topics:

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  1. Source: MedLinePlus (NIH): nasalcancer.html
  2. Source: MeSH (U.S. National Library of Medicine)
  3. Source: NCI Thesaurus
  4. ibid.
  5. ibid.

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Note: This site is for informational purposes only and is not medical advice. See your doctor or other qualified medical professional for all your medical needs.