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The nasal cavity conditions the air to be received by the lungs, and filters out dust and pathogens. It is divided into two sections (nostrils) by the nasal septum.

Paranasal sinuses are air-filled spaces that lighten the weight of the skull, produce mucus, and contribute to voice resonance. They are named: frontal, maxillary, ethmoid, and sphenoid sinuses.

The frontal sinuses are located above the eyes in the frontal bone and produce mucus that drains into the nasal cavity, also contributing to voice resonance.

The choanae are the two openings at the back of the nasal cavity that connect to the pharynx, allowing for the passage of air from the nose into the throat.

The olfactory bulb is a neural structure located in the upper part of the nasal cavity, responsible for processing information about odors and is part of the olfactory system.

The nasal septum separates the nasal cavity into two nostrils. It supports the nose and directs airflow, and is partly made up of cartilage and bone.

The maxillary sinuses are the largest of the paranasal sinuses. They are located beneath the eyes, in the maxillary bone, and produce mucus.

The sphenoid sinuses are located behind the eyes in the sphenoid bone. They are responsible for mucus production and have a role in regulating the temperature and humidity of inhaled air.

The conchae, or turbinate bones, increase the surface area of the nasal cavity to warm and moisturize the air entering the nose. There are three pairs: superior, middle, and inferior.

The nasolacrimal duct drains tears from the lacrimal sac into the nasal cavity, providing a pathway for tear elimination.

The ethmoid sinuses are a group of small air cells located between the nose and eyes, within the ethmoid bone, and are involved in mucus production and protection against pollutants.

The anterior ethmoidal sinus is one of the ethmoid air cells located close to the front of the skull base and plays a role in warming and humidifying inhaled air.

The posterior nasal apertures are also called choanae and provide a connection between the nasal cavity and the nasopharynx for the passage of air.

The nasal meatuses are passages in the nasal cavity below each concha; they provide air flow and are named superior, middle, and inferior.

The nasopharynx is an air passage between the nasal cavity and the pharynx; it also serves as a pathway for drainage of the Eustachian tubes.

The inferior nasal concha is an independent bone that forms part of the lateral walls of the nasal cavity, helping to filter and warm inhaled air.

The sphenopalatine foramen provides a passage for the sphenopalatine artery and nerves to enter the nasal cavity, crucial for supplying blood and innervation to the area.

The posterior ethmoidal sinus is one of the ethmoid air cells located near the back of the skull base and contributes to the conditioning of inhaled air.

Kiesselbach’s Plexus is an area of capillary networks in the anterior part of the nasal septum prone to nosebleeds, as it's a common site where several arteries supplying the nose meet.