Tympanic nerve

The tympanic nerve (nerve of Jacobson) is a branch of the glossopharyngeal nerve found near the ear.Lesser petrosal nerveSympathetic connections of the otic and superior cervical ganglia. The tympanic nerve (nerve of Jacobson) is a branch of the glossopharyngeal nerve found near the ear. It arises from the petrous ganglion, and ascends to the tympanic cavity through a small canal, the inferior tympanic canaliculus, on the under surface of the petrous portion of the temporal bone on the ridge which separates the carotid canal from the jugular fossa. In the tympanic cavity it divides into branches which form the tympanic plexus and are contained in grooves upon the surface of the promontory.