Before exiting the jugular foramen, the tympanic nerve enters the petrous portion of the temporal bone and ascends via the inferior tympanic canaliculus to the tympanic cavity.
2.
In the bony ridge dividing the carotid canal from the jugular fossa is the small inferior tympanic canaliculus for the passage of the tympanic branch of the glossopharyngeal nerve.
3.
These parasympathetic, preganglionic secretomotor fibers originate from the glossopharyngeal nerve ( CN IX ) as one of its branches, the tympanic nerve, which enters the tympanic cavity through the inferior tympanic canaliculus.
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