Within the tympanic cavity the tympanic nerve forms a plexus on the surface of the promontory of the middle ear to provide general sensation.
2.
The tympanic nerve and postganglionic sympathetic fibers, which come with the arteries-related head, make the tympanic plexus on the promontorium.
3.
The visceral motor fibers pass through both ganglia without synapsing and exit the inferior ganglion with CN IX general sensory fibers as the tympanic nerve.
4.
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.
5.
The preganglionic fibers depart CN IX as the tympanic nerve and continue to the middle ear where they make up a tympanic plexus on the cochlear promontory of the mesotympanum.
6.
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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