The glossopharyngeal nerve carries taste from the posterior tongue, general sensation from the pharynx, and supplies the carotid body and sinus reflexes, making it the nerve of gag reflex sensation and swallowing initiation. Its motor supply is limited to the stylopharyngeus, which elevates the pharynx during swallowing. CN IX and X together orchestrate the pharyngeal phase of swallowing through their combined pharyngeal plexus innervation.
| Origin | Cranial nerve IX arising from the nucleus ambiguus and inferior salivatory nucleus in the medulla |
|---|---|
| Course | Exits the skull through the jugular foramen alongside CN X and XI, descends between the internal and external carotid arteries, and distributes to the pharynx, tonsil, and posterior tongue |
| Motor | |
| Sensory |
|
Glossopharyngeal neuralgia produces severe paroxysmal pain in the throat, tonsil, and ear triggered by swallowing, talking, or yawning, the most painful and most dramatic of the cranial neuralgias after trigeminal neuralgia. Carbamazepine is first-line treatment; glossopharyngeal nerve section or microvascular decompression is performed for refractory cases. Carotid sinus hypersensitivity from excess CN IX carotid sinus afferents can produce syncope from minimal neck pressure.
Paroxysmal severe throat and ear pain triggered by swallowing, treated with carbamazepine and rarely requiring glossopharyngeal nerve section or microvascular decompression.
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