Fill in the Blank QuestionFill in the blank question.The hollow spaces located within the frontal, sphenoid, maxillary, and ethmoid bones are called .

The hollow spaces located within the frontal, sphenoid, maxillary, and ethmoid bones are called sinuses.

Sinuses are air-filled cavities that serve several functions, including reducing the weight of the skull, enhancing voice resonance, and providing a buffer against facial trauma. They also have a role in the production of mucus, which helps in trapping pathogens and foreign particles from entering the respiratory system. These sinuses collectively make up the paranasal sinus system, allowing for proper drainage into the nasal cavity and contributing to overall respiratory health. The four main types of paranasal sinuses include the frontal sinuses (located above the eyes), maxillary sinuses (found in the cheeks), ethmoid sinuses (situated between the eyes), and sphenoid sinuses (located deeper in the skull).