Nose

The prominent structure on the face responsible for breathing, filtering air, and sensing smell.

The nose is an external structure that serves as the primary entrance for air into the respiratory system. It plays a crucial role in olfaction, the sense of smell, and also helps to warm and humidify inhaled air. The nose consists of the external part that is visible on the face and a complex internal structure that houses the nasal cavities.

Terminologia Anatomica

nasus

System

Respiratory system

Function

One of the nose's primary functions is respiration, which involves the inhalation of air and the exhalation of carbon dioxide. This process is essential for gas exchange in the lungs. The nasal passages are lined with mucous membranes that trap dust, allergens, and other particles, thereby cleaning the air before it reaches the lungs. In addition, the nose plays a significant role in the sense of smell. Olfactory receptors within the nasal cavities detect airborne chemicals, allowing us to perceive a vast array of scents. This sensory capability not only enhances our ability to enjoy food and fragrances but also serves as a warning system by detecting harmful substances or spoiled materials. Furthermore, the nose helps to regulate airflow, which aids in maintaining appropriate respiratory conditions and contributes to voice resonance.

Location

The nose is centrally located on the face, situated just above the mouth and below the forehead. It protrudes from the mid-line of the face and is bordered by the cheeks on either side. The external part of the nose is composed of cartilage and skin, which forms the bridge and tip. Internally, the nose leads into the nasal cavities that lie above the oral cavity and connect to the pharynx in the throat. The nasal cavities are divided by a thin structure called the nasal septum and feature turbinates that help increase the surface area for air filtration.

Did You Know?

The human nose can detect over a trillion different scents.
The external shape of the nose is influenced by genetics and environmental factors.
Each nostril can detect smells differently; this is called bilateral olfaction.
Humans have a highly developed sense of smell compared to many other species, which can significantly affect taste identification.