The tympanic nerve ("tympanic cavity nerve ") is a branch of the IX. Cranial nerve ( glossopharyngeal nerve ). The fibers of the nerve originate from the nucleus salivatorius inferior (lower core of the salivary gland) of the medulla oblongata (elongated medulla).
The tympanic nerve starts at the inferior ganglion and runs at the base of the petrosal fossula into the tympanic canaliculus and from there further under the promontory to the floor of the tympanic cavity . There he cares for the middle ear (tympanic cavity and ear trumpet) sensitively.
In the middle ear, the nerve with sympathetic fibers from the superior cervical ganglion forms the tympanic plexus ( plexus tympanicus ). For this mesh of springs nerve petrosal ( "small tympanic cavity nerve"), the parasympathetic fibers through the foramen lacerum or fissure sphenopetrosa for otic ganglion leads (so-called Jacobson anastomosis ). In the otic ganglion, the fibers are switched to the second neurons and are attached to the auriculotemporal nerve via a connecting branch ( ramus communicans ) , via which they connectParotid gland . Parasympathetic fibers reach the cheek glands via a further connecting branch that attaches to the buccal nerve . The branches stimulate the secretion of these salivary glands .
In individual cases, neuralgia of the nerves has been described, which manifests itself in sudden shooting pain in the ear and throat.
- Walther Graumann (ed.): Compact textbook anatomy. Volume 4: Sensory systems, skin, CNS. Peripheral pathways. Schattauer, Stuttgart et al. 2005, ISBN 3-7945-2064-5 .
- R. Heidrich, R. Claus, W. Stojanow: To the problem of the plexus tympanicus neuralgia. In: German journal for neurology. Vol. 182, No. 4, 1961, doi: 10.1007 / BF00243611 ). , pp. 419-424, (