Nasal polyps surgery reviews. The openings from the nasal cavity into the pharynx are the internal nares. Nasal congestion is the most common condition affecting your nose. Nasal congestion is the most common condition affecting your nose. Learning the anatomy of the nose can help you better understand how the nose works. The shape of the nose is determined by the nasal bones and the nasal cartilages, including the nasal septum, which separates the nostrils and divides the nasal cavity into two. It provides air for respiration, serves the sense of smell, conditions the air by filtering, warming, and moistening it, and cleans itself of foreign debris extracted from inhalations. Other structures inside and behind the nose help you breathe. Inside the nose is the nasal cavity, which is divided into two passages by the nasal septum. Air enters the nasal cavity from the outside through two openings: the nostrils or external nares. . rdnmu xgch xvay qlpav abehi agyerm wtwrzc xsvaei lybo jix