Nose and Nasal Cavity
The nose and nasal cavity form the main external opening for the respiratory system and are the first section of the body’s airway—the respiratory tract through which air moves.
The mouth, also known as the oral cavity, is the secondary external opening for the respiratory tract.
The pharynx, also known as the throat, is a muscular funnel that extends from the posterior end of the nasal cavity to the superior end of the esophagus and larynx.
The larynx, also known as the voice box, is a short section of the airway that connects the laryngopharynx and the trachea.