Nasal cavity

Definition

The nasal cavity is a large, air-filled space above and behind the nose in the middle of the face. It functions as the main pathway for inhaled air to be filtered, warmed, and humidified before reaching the lungs.

5 Must Know Facts For Your Next Test

1. The nasal cavity contains olfactory receptors responsible for the sense of smell.
2. It is lined with mucous membranes and cilia that trap and expel foreign particles.
3. The nasal septum divides the nasal cavity into two nostrils.
4. Normal microbiota in the nasal cavity include Staphylococcus aureus and Corynebacterium species.
5. Infections such as rhinitis can originate in the nasal cavity and spread to other parts of the respiratory tract.

Review Questions

• What role do cilia play in the nasal cavity?
• Name two types of normal microbiota found in the nasal cavity.
• How does the nasal cavity contribute to respiratory health?

Related terms

Olfactory Receptors: Sensory receptors within the nasal cavity responsible for detecting odors.

Mucous Membrane: A tissue lining various body cavities including the nose, which secretes mucus to trap pathogens.

Cilia:

Microscopic hair-like structures on cells within the nasal cavity that move mucus and trapped particles out of the respiratory system.