Jacobson nerve

Jacobson nerve is the tympanic branch of the glossopharyngeal nerve (CN IX) and arises from the inferior ganglion of the glossopharyngeal nerve. It also carries preganglionic parasympathetic fibres, from the inferior salivary nucleus, which eventually enter the otic ganglion

Jacobson nerve enters the tympanic cavity via the inferior tympanic canaliculus and contributes to the tympanic plexus located on the cochlear promontory. The parasympathetic fibres leave the plexus as the lesser petrosal nerve.

The neuroendocrine cells related to this nerve give rise to glomus tympanicum tumours.

A Jacobson nerve schwannoma is a rare middle ear tumour presenting as a mass along the cochlear promontory.

History and etymology

The nerve is named after Ludwig Jacobson, a Danish anatomist.

Anatomy: Brain
Share article

Article information

rID: 1531
Section: Anatomy
Synonyms or Alternate Spellings:
  • Jacobson's nerve
  • Tympanic branch of glossopharyngeal nerve

Support Radiopaedia and see fewer ads

Cases and figures

  • Drag
    Figure 1: diagram of Jacobsen nerve
    Drag here to reorder.
  • Updating… Please wait.

    Alert accept

    Error Unable to process the form. Check for errors and try again.

    Alert accept Thank you for updating your details.