5 osa. The outer nasal cartilages The nasal cavity, maxillary, frontal and ethmoid sinuses The opened maxillary sinus when the zygomatic arch is removed The following nose and paranasal sinuse structures are shown in a median section: The nasal cavity, lined with mucosa, with the nasal conchae (removable) The arteries of the mucous membrane The olfactory nerves The innervation of the lateral wall of the nasal cavity, the nasal conchae and the roof of mouth (palate).