What is the primary function of the sinuses?

The primary function of the sinuses is to reduce the weight of the skull and aid in resonance. The sinuses are air-filled cavities located within the bones of the skull, which contribute to the overall structure by making it lighter, thus providing an advantage in mobility and reducing strain on neck muscles. Additionally, the connection of these sinuses to the nasal cavity enhances the resonance of the voice, as the air within the sinuses can modify sound waves produced during speech. This dual role of reducing weight and aiding in vocal resonance is essential for both physical and functional aspects of the skull.