the first portion of the respiratory tract is made up of the nose ( or external nose ) and an open inner chamber called the nasal cavity.
protruding prominently from the face, the nose serves as a vent for air exchange.
two opening called anterior nares ( or nostrils; exterior nares ) allow air to enter the nose and pass into the nasal cavity. Individually, each opening is referred to as an anterior naris.
Inside the nasal cavity, inhaled air is Dense fibrous connective tissue supports the rounded lateral walls of the nostrils, which are called ala nasi.