The fibres then hitchhike on the auriculotemporal nerve to the parotid gland, where they have a secretomotor effect. From the ear, the fibres continue as the lesser petrosal nerve, before synapsing at the otic ganglion. These fibres travel with the tympanic nerve to the middle ear. These fibres originate in the inferior salivatory nucleus of CN IX. The glossopharyngeal nerve provides parasympathetic innervation to the parotid gland. This muscle acts to shorten and widen the pharynx and elevate the larynx during swallowing. The stylopharyngeus muscle of the pharynx is innervated by the glossopharyngeal nerve. The glossopharyngeal nerve provides taste sensation to the posterior 1/3 of the tongue, via its lingual branch ( Note: not to be confused with the lingual nerve). Fig 2 - Overview of the branches of the glossopharyngeal nerve.
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