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glossopharyngeal nerve behind tongue
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In this image the tongue has been reflected medially. Also observe what happens when you don't brush your teeth.

The glossopharygeal nerve (CN IX) is tested by eliciting the gag reflex. Generally, the glossophargeal nerve is responsible for sensation in the oropharynx while the vagus mediates the motor response. However, because the gag reflex has also been observed after sectioning the glossopharyngeal nerve, it is possible that the vagus nerve also plays a sensory role. The glossopharyngeal nerve may also be assessed by evaluating general and special sensory (taste) functions of the posterior 1/3 of the tongue.
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