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 under the bone of the inside corner of each eye.
- Frontal sinus: located under each side of the forehead bone above the eyes and bridge of the nose.
- Sphenoid sinus: located behind each side of the ethmoid sinuses.
Not sinuses, but also very important as they connect to your nasal and sinus tract
- Eustachian tube: the tube that clears pressure within your ears
- Tear duct: (nasolacrimal duct) drains your tears from the inside corner of the eye and into the nasal cavity
- Septum: The piece of cartilage and bone that separates the two nasal passages
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. But your sinuses can become blocked and inflamed due to a bacterial, viral, or fungal infection, allergies, environmental conditions, or some diseases. That can result in discomfort, pain, and fever.
Side view of Sinuses
The Ethmoid Sinuses