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THE PHARYNX - THE PHARYNX-the throat a funnel-shaped tube...

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THE PHARYNX -the throat; a funnel-shaped tube that connects the nasal cavity and mouth superiorly to the larynx and esophagus inferiorly. A. The Pharynx is divided into three major regions : 1. The Nasopharynx -posterior to the nasal cavity, this serves only as an air passageway. a. During swallowing, the uvula moves to close off the nasopharynx; thus preventing food from moving into the nasal cavity. b. Pharyngeal tonsil (Adenoid )-located on the posterior wall of the nasopharynx. These trap and destroy pathogens entering the nasopharynx via air. If these become enlarged, they can block the flow of air through the nose and into the throat. As a result, the air is not properly warmed before it enters the lungs. The person may breathe with their mouth open. c. 4 Openings into the Nasopharynx 1) 2 Internal Nares 2) 2 Auditory (Eustachian) Tubes -these drain the middle ear cavity to equalize pressure in the ear with atmospheric pressure. 2. The Oropharynx -posterior to the oral cavity, opens into the mouth through the fauces . Both swallowed food and inhaled air pass through here.
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