Entry point for the air we breathe, processes the air before it goes to the lungs and is an efficient humidifier and filtration apparatus.

Produces about 2 liters of mucus daily.

Mucous traps particulate matter and prevents such particles from entering the lungs.

Mucous is swallowed and impurities go to the stomach and are expelled by the gastrointestinal tract.

Warms the air preventing frigid air from irritating the lungs.

Seat of olfactory process providing the sensation of smell.

With the sinuses adds resonance to the voice.

Well supplied with blood, from the internal and external carotid systems.

Nasal bone most commonly fractured facial bone, and maybe the most commonly broken bone in the human body.

Has 300-400 olfactory receptors types that are sensitive to molecular substances in the air, and can establish a pattern of signals t the brain recognized as a particular smell.

A 3- layered structure with a inner, middle and outer layer.

Nasal inner layer of nose and para nasal sinuses is lined by pseudostratisfied epithelium consisting of ciliated and nonciliated columnar cells, basal and goblet cells.

The middle layer is made of bone in the upper third and cartilage in the lower 2/3 of the nose.

The outer layer is the nasal skin.

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