Noses come in many different shapes and sizes. Every person has a unique one. Nevertheless, they are always made up of bone and cartilage. They also consist of an external and an internal part. Both are divided into the following areas:
- Nasal Vestibule
- Nasal passage
- Olfactory nerves
- Triangular cartilage
- Alar cartilage
- Septal cartilage
- Nasal concha
The outer part of the nose
The outer shell of the olfactory organ consists mainly of bone and cartilage tissue. Several rigid bones, each with numerous projections, form its base. Some of these projections extend into the maxilla, while others extend into the frontal bone. Directly between the eyes lies the so-called nasal bone. Due to its central location, it is particularly prone to injuries and fractures.
The bones occupy only a very small amount of space inside the nose. A significantly larger portion is filled with cartilage. This cartilage is very flexible and protects the bones from injury. However, the nose does not consist of a single continuous piece of cartilage, but rather of numerous individual elements, most of which are arranged in pairs.
The triangular cartilage and the nasal tip cartilage are responsible for the nose’s characteristic shape. Both protect the bony framework and maintain the nose’s shape. The alar cartilages, on the other hand, form the nostrils and provide them with the necessary support. In addition, the nose also contains what is known as the septal cartilage. This originates from the bone and divides the nose into two distinct chambers. You can receive comprehensive consultation and treatment at a specialized ENT practice.
The Inner Part of the Nose
The vestibule is located directly at the entrance to the nose. It extends from the outer end of the nostril to the lower edge of the triangular cartilage. It occupies a special position in the nose because, unlike all other parts, it is not lined with mucous membrane. Instead, it is covered by ordinary facial skin.
Behind the vestibule lies the main nasal cavity. It comprises a total of three turbinates as well as the bony lamellae. These are covered with a thick mucous membrane and protrude from the lateral nasal wall into the main cavity. Due to their ridge-like structure, they greatly increase the surface area of the nasal mucosa and also regulate airflow within the nose.
A nasal passage runs beneath each of the three turbinates. The lower of the three passages opens into the tear duct. Therefore, part of the tear fluid is drained through this passage. While the upper passage is connected only to one paranasal sinus, the middle passage leads to three paranasal sinuses. The rear part of the main nasal cavity also contains the two so-called choanae. These are openings that transport inhaled air through the trachea into the lungs.
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The human nose performs numerous functions. In doing so, it fulfills not only essential biological but also social roles. These can be broadly categorized as follows:
- Adaptation of inhaled air
- Identification of odors
- Sound and voice production
Regulation of Inhaled Air
When we inhale fresh air, dust particles and bacteria also enter the nose. For this reason, the nose traps a large portion of these unwanted substances and expels them. This is why nasal hairs serve as the immune system’s first line of defense. Furthermore, foreign objects are expelled through the sneezing reflex with a powerful burst of air. Finally, the nasal mucosa is lined with a layer of so-called cilia. These hairs, known in technical terms as cilia, use a wave-like motion to transport many pathogens into the throat, where they are either swallowed or coughed up.
In general, the lungs prefer warm and slightly moistened air. For this reason, the nasal mucosa supplies the passing air with moisture and warms it via blood vessels. In this way, the nose facilitates optimal processing of the inhaled air in the lungs.
Identification of Odors
Furthermore, humans also use this sensory organ to detect various odorous substances. This function is performed by the olfactory mucosa in the upper part of the nose. It analyzes the components of the air flowing past and then transmits a signal to the olfactory bulb. There, olfactory nerves relay the signals to the olfactory center in the brain. Although this process is complex, it takes place in a matter of moments. In this way, the nose enables a rapid analysis of the odors present, allowing the body to distance itself from foul-smelling substances that are classified as potentially toxic.
Sound and Voice Production
Ultimately, the nose also plays a crucial role in communication. It serves as a resonance chamber for the body, thereby enabling the production of complex sounds. In this way, it contributes significantly to voice production and facilitates better communication. This function becomes particularly noticeable whenever the nose is congested due to a cold. In such situations, the human voice usually sounds very muffled, and those affected have difficulty producing certain sounds.
Bacteria and viruses attack every part of the nose and can cause serious illnesses in some cases. These are generally classified as diseases of the external nose, the internal nose, and the paranasal sinuses.
Nasal conditions include, among others:
The external nose is primarily affected by deformities and skin conditions. These include nasal fistulas, nasal teeth, and so-called nasal clefts. Many deformities are caused by a hereditary condition. However, in some cases, viruses or accidents are also responsible. Furthermore, many people suffer from nasal boils at some point in their lives. These cause not only severe redness but also swelling of the entire face. At the same time, nasal boils are accompanied by severe pain and a high fever. Since the pus formed in the boils can travel through the blood and lymphatic systems and reach the brain, this skin condition can even be fatal in some cases.
The inner nose, however, is primarily affected by non-life-threatening conditions. These are generally accompanied by difficulty breathing through the nose. In addition to inflammation and the common cold, they often trigger nosebleeds as well. In such cases, the blood vessels in the dried-out nasal mucosa swell so much that they burst. Bleeding originating from the back of the nose is much less common. However, these cases are very dangerous, as they can lead to severe blood loss.
Finally, illnesses can also affect the sinuses. These primarily include the flu and sinusitis. These conditions severely impair breathing, so they always require medical treatment.
Overall, the anatomy of the nose shows that the external and internal structures of the nose, together with the nasal passages and sinuses, play a central role in the human body. The external nose consists of bone and cartilage, including the os nasale, the nasal bone, and the cartilago alaris major, and defines the shape of the nose in the center of the face. The structure of the nose also includes the nasal cavity itself, also known as the cavum nasi, which is divided into two nasal cavities by the nasal septum.
The nose consists of two regions with three nasal passages, in which the nasal conchae and the nasal meatus regulate airflow. The upper nasal passage contains olfactory cells that enable the sense of smell and support the senses of smell and taste. The mucous membranes line the cavity and protect against foreign bodies entering the nose as well as against pathogens in the nasal region.
The paranasal sinuses—such as the maxillary sinus, frontal sinus, and ethmoid sinuses—are air-filled spaces within the skull and are connected to the nasal cavity. Nasal conditions, such as sinusitis or allergies, can cause nasal congestion and impair the nose’s function.
The human nose is an important part of the respiratory system, as it filters and prepares the inhaled air. The external nose and the internal nose work together, with access to the internal nose provided by the nostrils. Overall, the structure and function of the nose demonstrate that each part consists of specialized structures that collectively provide protection, facilitate breathing, and enable sensory perception.
What is the function of the nose?
The function of the nose is to filter, warm, and humidify inhaled air. At the same time, as the organ of smell, it is responsible for the sense of smell.
What is the anatomy of the nose?
The anatomy of the nose includes the external nose, the internal nose (comprising the nasal cavity, nasal septum, and turbinates), and the paranasal sinuses. These structures work together to facilitate breathing and the sense of smell.
What are some common nasal conditions?
The most common disorders of the nose include the common cold, nosebleeds, allergies, and sinusitis. These can impair nasal breathing and affect the nasal mucosa.
What are the paranasal sinuses?
The paranasal sinuses are air-filled cavities in the skull bones that are connected to the nasal cavity. These include the maxillary sinus, frontal sinus, and ethmoid sinuses.
Why is the nasal mucosa important?
The nasal mucosa protects the airways by trapping foreign particles and removing them via cilia. It plays an important role in defending against pathogens and moistening the air we breathe.
