Pharynx - Digestive System Pharynx It can be divided into...

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Digestive System Pharynx It can be divided into three areas: * Nasopharnyx - communicates with the nasal cavity and provides a passageway for air during breathing. * Oropharynx - opens behind the soft palate into the nasopharynx. It functions as a passageway for food moving downward from the mouth and for air moving to and from the nasal cavity. * Laryngopharynx - located just below the oropharynx. It opens into the larynx and esophagus. Swallowing (Deglutition) * Coordinated by swallowing center in the medulla oblongata and pons * Communicates with the muscles of the pharynx and esophagus via the trigeminal (V), facial (VII), glossphyryngeal (IX), and hypoglossal (XII) nerves * Swallowing occurs in three stages * Buccal phase * Pharyngeal-esophageal phase Stages of Swallowing Buccal phase * The voluntary stage in which the tongue collects food, presses it against the plate to form a bolus, and pushes it back into the oropharynx Pharyngeal-esophageal phase * Three actions block food and drink from reentering the mouth or entering the nasal cavity
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This note was uploaded on 01/30/2012 for the course BSC BSC1085 taught by Professor Sharonsimpson during the Fall '10 term at Broward College.

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Pharynx - Digestive System Pharynx It can be divided into...

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