Human nose

Your nose does many jobs.

It helps you breathe in air. Small hairs in your nose catch dust. This keeps the dust out of your lungs.

The inside of your nose is wet. It warms and moistens the air you breathe. This helps your body stay healthy.

Your nose also helps you smell. Special cells inside help you find scents.

Your nose even helps you talk. It helps make certain sounds when you speak.

Bones and soft parts give your nose its shape. It is a very busy part of your body!

Your nose is a busy part of your body.

It is the start of your breathing system. It also helps you with the sense of smell. We call this sense olfaction.

Your nose does many important jobs. It helps you breathe air into your lungs. Small hairs in your nostrils catch dust. This keeps large bits of dirt out of your lungs. The inside of your nose is wet. This wet lining warms and moistens the air you breathe. Shell-like bones called nasal conchae help with this task.

Your nose even helps you talk. It helps make sounds like nasal vowels. Hollow spaces called paranasal sinuses act like sound chambers. They help change and grow the sounds of your voice.

Bones and cartilage give your nose its shape. A wall called the nasal septum divides the nose into two parts.

Muscles in your face can move your nose. They can flare your nostrils or pull your nose down. This helps you control how much air you breathe in.

Your nose is a very busy part of your body. It is the first organ of the respiratory system, which helps you breathe.

It is also the main part of the olfactory system. This is the system that gives you the sense of smell. The nose is shaped by hard nasal bones and flexible nasal cartilages. A wall called the nasal septum divides the inside into two parts.

This structure is important for many things you do every day.

Your nose works in several clever ways to keep you healthy. When you breathe in, nasal hair in your nostrils catches large particles. This stops dirt from entering your lungs. The inside of your nose is lined with a wet layer called mucosa.

This lining warms and moistens the air you breathe. Shell-like bones called nasal conchae help this conditioning happen. If something irritates this lining, your body uses a reflex called sneezing. This quick action expels unwanted particles from your nose.

Smelling is another major job for your nose. There is a special area called the olfactory epithelium in the upper nasal cavity.

This area contains specialized olfactory cells that detect smells. Your nose even helps you speak through a process called nasalisation. This helps you make nasal vowels and consonants. Hollow spaces called paranasal sinuses act as sound chambers.

These chambers modify and amplify your vocal sounds.

Many different parts make up the framework of the nose. The bones include the maxilla, the frontal bone, and the ethmoid bone.

The septum is made of bone at the top and cartilage near the tip. There are also several types of cartilage, like the septal and alar cartilages.

Muscles in your face can move your nose in different ways. For example, the nasalis muscle can flare your nostrils. The procerus muscle can wrinkle the bridge of your nose.

Because the nose is so important, doctors sometimes perform surgery on it. These procedures are called rhinoplasties. Some are used to fix structural defects from injury or birth. This is known as reconstructive surgery. Other people choose elective cosmetic surgery to change the shape of their nose. The thickness of your skin also changes across the nose. It is thick at the tip and very thin at the bridge.

The human nose serves as the primary entry point for the respiratory system. It also functions as the central organ for the olfactory system, which allows for the sense of smell. This complex structure is shaped by a combination of nasal bones and various nasal cartilages. A central wall known as the nasal septum divides the internal nasal cavity into two distinct passages.

Beyond breathing and smelling, the nose plays a role in speech and sound modification. It is a highly specialized organ designed to protect, condition, and sense the environment.

When you inhale, the nose performs several critical conditioning steps. First, nasal hair located in the nostrils acts as a filter to catch large particles. This prevents debris from moving deeper into the lungs. The nasal mucosa, a moist lining, then warms and moistens the air.

This process is aided by the nasal conchae, which are shell-like bones within the nasal cavity walls. If an irritant touches the mucosal lining, the body triggers a sneezing reflex. This reflex expels unwanted particles through aerosols, which can sometimes transmit infections.

The internal structure of the nose is a sophisticated bony-cartilaginous framework. The upper bony portion is formed by the frontal bone and the maxilla.

The internal roof of the nasal cavity features the cribriform plate of the ethmoid bone. This perforated plate allows the olfactory nerve's sensory fibers to pass through. The nasal septum provides the midline division, consisting of bone at the top and cartilage near the tip. The floor of the nose is created by the incisive bone and the palatine bones, forming the hard palate.

Cartilage provides the necessary flexibility for the nose to function and move. The septal cartilage extends from the nasal bones down to the floor of the cavity. Several other cartilages, such as the lateral and alar cartilages, shape the external appearance.

The major alar cartilages are U-shaped plates that form the walls of the vestibule. These cartilages include the medial and lateral crura, which meet at the columella. A structure called the nasal scroll helps prevent the airway from collapsing due to airflow pressure. This arrangement allows the nostrils to be modified by muscle control.

A variety of facial muscles are responsible for the movements of the nose. The procerus muscle can wrinkle the skin over the bridge of the nose during concentration. The nasalis muscle has two parts: the compressor naris, which can close the nostrils, and the dilator naris, which flares them.

The depressor septi nasi muscle can pull the tip of the nose and the septum downward. These muscles are part of a continuous layer called the superficial muscular aponeurotic system, or SMAS. This system connects the muscles and ligaments from the nasal tip to the forehead.

The soft tissues of the nose vary significantly in thickness and composition. The skin is thick and flexible near the glabella but becomes very thin at the bridge.

At the tip, the skin is thick again and contains many large sebaceous glands. Beneath the skin, there are four distinct layers: a superficial fatty layer, the fibromuscular SMAS layer, a deep fatty layer, and the periosteum. The nasal cavity itself is divided into the nasal vestibule and the nasal cavity proper. The vestibule is the front part, lined with skin and hair follicles.

Understanding the nose also involves looking at how it affects sound and medical care. The paranasal sinuses are hollow cavities that act as sound chambers. These chambers help to modify and amplify vocal sounds during speech. Nasalisation is the process used to produce specific nasal vowels and consonants. Because of its importance, doctors may perform rhinoplasties to correct structural defects.

These can be reconstructive surgeries for trauma or congenital issues, or elective cosmetic surgeries to change the nose's shape.