The nasal bone, cartilage, and the septum determine the shape of your nose. The bone supports the bridge of the nose. The upper cartilage supports the sides of the nose. The nasal cartilage creates the width and shape of your nose. The nasal cavity is the hollow space behind the nose through which air flows. The septum, made of bone and cartilage, separates the nose. The septum creates two nasal cavities.
The mucous membrane lines the inside of your nose, throat, and sinuses. It warms and cleans the air you breathe in. The sinuses are the hollow chambers around your nose that drain the mucus.
The turbinates are the curved bony ridges inside the nose. They also help warm and clean the air. Cilia, the little hairs in your nose, are there to further filter the air you breathe. Cilia protects from dust and other particles from getting into the lungs.
When you breathe in through your nose the cilia, mucous membrane, and turbinates filter the air. The air travels from your nose to your lungs and bronchial tubes through the trachea.