Respiratory System Divisions Frontal sinus Nasal cavity asal conchae Sphenoidal sinus Nose Internal nares Upper airway Tongue larynx Hyo Nose, pharynx Esophagus larynx and Trachea associated Bronchus structures LUNG Lower Airway Bronchioles trachea bronchi lungs Diaphragm8 Respiratory System Divisions • Upper Airway – Nose, pharynx, larynx and associated structures • Lower Airway – trachea, bronchi, lungs