The nose is the organ of smell located in the middle of the face
external meatus – triangular-shaped projection in the center of the face.external nostrils – two chambers divided by the septum.septum – made up primarily of cartilage and bone and covered by mucous membranes. The cartilage also gives shape and support to the outer part of the nose.nasal passages – passages that are lined with mucous membranes and tiny hairs (cilia) that help to filter the air.sinuses – four pairs of air-filled cavities, also lined with mucous membranes.
There are four different types of sinuses:
ethmoid sinus – located inside the face, around the area of the bridge of the nose. This sinus is present at birth, and continues to grow.maxillary sinus – located inside the face, around the area of the cheeks. This sinus is also present at birth, and continues to grow.frontal sinus – located inside the face, in the area of the forehead. This sinus does not develop until around 7 years of age.sphenoid sinus – located deep in the face, behind the nose. This sinus does not develop until adolescence.