What are the small cavites in the head?

The small cavities in the head are known as sinuses, which are air-filled spaces located within the bones of the skull. The main sinuses include the frontal, maxillary, ethmoid, and sphenoid sinuses. These cavities help reduce the weight of the skull, improve voice resonance, and play a role in humidifying and filtering the air we breathe. Sinuses also produce mucus, which helps trap pathogens and particles, contributing to respiratory health.