Nasal Turbinates

The Nasal Turbinates include three or sometimes four bony shelves
projecting from the lateral wall of the nose. These processes are covered by mucous membrane containing large vascular spaces that can enlarge to control the caliber of the nasal cavity, facilitating heat and water exchange, and increasing the surface area of the nose.

Middle Turbinate The middle turbinate is a process of the ethmoid bone. It overlies
the middle meatus.

Middle Meatus The middle meatus is wide and is associated with the hiatus
semilunaris.

The nasal mucosa becomes swollen and inflamed (rhinitis) during upper respiratory infections and allergic reactions. Swelling of the mucosa occurs readily because of its vascularity. Infections of the nasal cavities may spread to the paranasal sinuses, lacrimal apparatus, and conjunctiva.