Nasal cavity

Nasal cavity is a large, air-filled space above and behind the nose in the middle of the face. Each nostril leads into a nostril cavity. The split of the nasal cavity is median, vertical and in the middle. The wall between the nostrils is called the nasal septum.

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Structure

The nasal cavity is divided into two segments: the respiratory segment and the olfactory segment. The respiratory segment is larger and is lined with ciliated pseudostratified columnar epithelium (also called respiratory epithelium). The conchae, or turbinates, are located in this region. The olfactory segment is located in and beneath the mucosa of the roof of the nasal cavity and the lateral wall, especially the middle and superior conchae. It is lined with a specialized type of pseudostratified columnar epithelium, known as olfactory epithelium.

Function

The nasal cavity conditions the air to be received by the other areas of the respiratory tract. It provides for the sense of smell and functions as a resonating chamber for speech.

Clinical significance

Infections or allergies can cause the nasal cavity to swell, leading to a condition called nasal congestion. Other conditions that can affect the nasal cavity include nasal polyps, nasal septum deviation, and nasal fracture.

See also

• Nasal concha
• Nasal septum
• Nasal vestibule
• Paranasal sinuses
• Nasopharynx

References

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