The tympanic nerve (Jacobson's nerve) is a branch of the glossopharyngeal nerve (CN IX) that enters the middle ear through the tympanic canaliculus, ramifies in the tympanic plexus on the medial wall of the tympanic cavity, and eventually continues as the lesser petrosal nerve to the otic ganglion. It carries parasympathetic fibres that ultimately supply the parotid gland, and sensory fibres to the middle ear mucosa, Eustachian tube, and mastoid air cells.
The tympanic nerve pathway is the anatomical basis for Frey syndrome (auriculotemporal nerve syndrome): after parotid surgery, regenerating parasympathetic fibres from the tympanic nerve pathway aberrantly innervate the facial skin sweat glands, causing gustatory sweating (sweating and flushing of the cheek and preauricular skin while eating). Tympanic neurectomy via middle ear surgery is occasionally performed for Frey syndrome. Glomus tympanicum tumours arise from paraganglionic tissue associated with the tympanic nerve on the cochlear promontory.
Aberrant regeneration of parasympathetic fibres from the tympanic nerve pathway into the auriculotemporal territory after parotidectomy causes gustatory sweating of the cheek during eating, managed with topical anticholinergic cream, botulinum toxin injections, or, in severe cases, tympanic neurectomy.
A paraganglioma arising from the tympanic nerve on the cochlear promontory presents as a pulsatile tinnitus and a reddish mass behind the eardrum visible on otoscopy, managed by surgical excision with or without preoperative embolisation.
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