Here's why:
* Paranasal sinuses are air-filled cavities within certain skull bones. They are connected to the nasal cavity and contribute to functions like:
* Lightening the skull
* Enhancing voice resonance
* Warming and humidifying inhaled air
* The mandible is the lower jawbone. Its primary function is chewing and it does not have the same structural requirements as the other skull bones that house sinuses.
Let me know if you'd like to know more about the paranasal sinuses!