Several bones that help form the walls of the nasal cavity have air-containing spaces called the paranasal sinuses, which serve to warm and humidify incoming air. Sinuses are lined with a mucosa. Each paranasal sinus is named for its associated bone: frontal sinus, maxillary sinus, sphenoidal sinus, and ethmoidal sinus. The sinuses produce mucus and lighten the weight of the skull.
Cut Rita Zahara
“The Nose and its Adjacent Structures,” Open Educational Resource (OER) - Unsyiah Library, accessed July 19, 2019, http://uilis.unsyiah.ac.id/oer/items/show/1351.