Nose: The external midline projection from the face. The purpose of the nose is to warm, clean, and humidify the air that a person breathes. In addition, it helps a person to smell and taste. The nose is divided into two passageways by a partition called the septum. Opening to these passageways are the nostrils. Bony projections, called turbinates, protrude into each breathing passage; they help to increase the surface area of the inside of the nose. There are three turbinates on each side of the nose (the inferior, middle, and superior turbinates). The sinuses are four paired air-filled chambers that empty into the nasal cavity.