The glossopharyngeal nerve provides sensation to the posterior tongue and oropharynx, taste from the posterior tongue, and parasympathetic secretomotor supply to the parotid. Its carotid sinus branch provides the afferent limb of the carotid sinus reflex. Glossopharyngeal neuralgia produces severe lancinating pain in the oropharynx, tonsil, and ear triggered by swallowing.
| Origin | Lateral medulla (sulcus between the olive and inferior cerebellar peduncle) |
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Glossopharyngeal neuralgia produces electric-shock pain in the throat and ear triggered by swallowing, yawning, or talking. It is distinguished from trigeminal neuralgia by its location and the swallowing trigger. Carbamazepine is first-line treatment; microvascular decompression of CN IX provides definitive surgical relief with 80-90% success.
CN IX lancinating throat and ear pain triggered by swallowing managed with carbamazepine or microvascular decompression.
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