What are the parts of nose and its definition?

The nose is a prominent facial feature and plays a crucial role in the respiratory and olfactory systems. It consists of several anatomical parts, each with its unique functions. Here are the main parts of the nose and their definitions:

1. Nostril (Nares):

- Definition: The nostrils are two external openings on the lower part of the nose, allowing air to enter and exit during breathing.

2. Ala (Lateral Nasal Cartilage):

- Definition: The alae are the soft, fleshy parts at the sides of the nostrils that flare out during deep breathing.

3. Septum:

- Definition: The nasal septum is a vertical wall of bone and cartilage that separates the nasal cavity into left and right chambers.

4. Nasal Turbinates:

- Definition: The turbinates are scroll-like bony projections protruding from the lateral walls of the nasal cavity, increasing surface area for air conditioning.

5. Nasal Conchae:

- Definition: The nasal conchae are subdivisions of the turbinates, including the inferior, middle, and superior conchae.

6. Ethmoid Bone:

- Definition: The ethmoid bone is a thin bone located between the eyes, forming part of the nasal septum and the roof of the nasal cavity.

7. Cribriform Plate:

- Definition: The cribriform plate is a perforated area of the ethmoid bone that allows the passage of olfactory nerves from the nasal cavity to the brain.

8. Olfactory Bulb:

- Definition: The olfactory bulb is a small, brain-like structure located above the nasal cavity, responsible for detecting odours and sending signals to the brain.

9. Sphenoid Sinus:

- Definition: The sphenoid sinus is an air-filled cavity located behind the nasal cavity, within the sphenoid bone. It is involved in regulating air pressure and sinus drainage.

10. Nasopharynx:

- Definition: The nasopharynx is the upper part of the pharynx located behind the nasal cavity and connecting it to the throat.

Understanding these parts of the nose helps in comprehending its functions, including respiration, olfaction (smelling), filtration of inhaled air, humidification, and resonance for speech.