Sinuses 101

Your sinuses, also known as the paranasal sinuses are cavities within the bones of your face that are filled with air. There are several sets of sinuses, and each one is named for the bone in which it’s located.

  • Maxillary sinus: contained within the bone of each cheek.
  • Ethmoid sinus: a honeycomb of multiple sinuses located between the eyes and the nose.
  • Frontal sinus: located in the forehead.
  • Sphenoid sinus: located deep in the skull behind the eyes.

Not sinuses, but also very important as they connect to your nasal and sinus tract

  • Eustachian tube: the tube that connects the ear to the "back of the nose" and equalizes air pressure.
  • Tear duct: (nasolacrimal duct) drains your tears from the inside corner of the eye and into the nasal cavity
  • Septum: The dividing wall between the two nasal cavities.

What your sinuses do for you

Your sinuses, which are lined with mucus-manufacturing membranes, serve a number of functions. The mucus is constantly cleared out of your sinus cavities and drains into your nasal passages.

The Ethmoid Sinuses
CT Scan of Sinuses

The Sinuses