5 May 2021
It is not known why we have sinuses. One theory is that they help humidify the air we breathe in, and another is that they enhance our voice.
Sinuses are a system of connected hollow cavities in the skull. They are lined with a soft, pink tissue called the mucosa. Except for a thin layer of mucus, the sinuses are empty.
- The maxillary sinuses are the largest, about 2.5 cm across, located between the nose and the cheekbones.
- The frontal sinuses are located in the low centre of the forehead.
- The ethmoid sinuses are located between the eyes.
- The sphenoid sinuses are located on the interior side of the bone of the nose.