The internal structure of the nose is primarily comprised of the nasal cavity, which is divided into two main parts: the nasal vestibule and the nasal cavity proper.
Understanding the Nasal Cavity
The nasal cavity is the large, internal space within the nose and is responsible for warming, humidifying, and filtering the air we breathe. It is not a single, uniform space but has distinct regions that perform different functions.
The Nasal Vestibule
- The nasal vestibule is the foremost, or front part, of the nasal cavity.
- It's essentially the entrance and is bordered by the cartilages that form the lower part of the nose.
- Lining: Unlike deeper parts of the nasal cavity, the vestibule is lined with skin.
- Features of the Lining: This skin contains:
- Hair follicles: These hairs help to trap large particles and prevent them from entering further into the respiratory system.
- Sebaceous glands: These glands secrete an oily substance called sebum, which helps to keep the skin moist and prevent it from drying out. This also helps trap particles.
The Nasal Cavity Proper
Beyond the vestibule lies the nasal cavity proper. While the reference text doesn't go into detail on its structure, we can infer it is the main region of the nasal cavity where air is processed before reaching the lungs. This area contains the nasal conchae or turbinates.
Summary Table
| Feature | Description | Location | Function |
|---|---|---|---|
| Nasal Cavity | Large internal space within the nose. | Internal Nose | Air processing (warming, humidifying, filtering) |
| Nasal Vestibule | Front part of the nasal cavity. | Front of Nasal Cavity | Entry point for air; traps large particles with hairs. |
| Lining of Vestibule | Skin, hair follicles, sebaceous glands. | Lining of Vestibule | Prevents drying; traps particles, keeps the area moist |
| Nasal Cavity Proper | Main section of the nasal cavity. | After the Nasal Vestibule | Further air processing. |
Practical Insights
- The hairs in your nasal vestibule are your first line of defense against airborne particles.
- The sebaceous glands keep the area moist, helping to trap those particles effectively.
