Upper Respiratory System 。 Upper respiratory normal microbiota may include pathogens Sinus Nasal cavity -Sinus Middle ear Auditory(eustachian)tube Oral cavity Opening of auditory tube Tongue- Tonsils Epiglottis Pharynx(throat) Larynx(voice box) Spine(backbone) Trachea(windpipe) Esophagus Figure 24.1 • Upper respiratory normal microbiota may include pathogens Upper Respiratory System Figure 24.1