How are the nasal cavities divided inside the human nose?

The human nasal cavity is divided into two distinct canals—left and right—by a thin medial wall known as the nasal septum, which is composed of both cartilage and bone.12

Each canal features a complex internal structure shaped by three bony ridges projecting from the lateral wall, called nasal conchae (or turbinates). These ridges create corresponding air passages beneath them known as the superior, middle, and inferior nasal meatuses.12

Functionally, the nasal cavity is divided into two primary regions:
* The Vestibule: The forward section located just inside each nostril, lined with skin and short hairs called vibrissae.12
* The Main Cavity: This area is further categorized into the respiratory portion, which cleans and conditions inspired air, and the olfactory region, located in the roof of the nose, which contains the sensory epithelium responsible for the sense of smell.12