Tympanic nerve

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Nerve: Tympanic nerve
Plan of upper portions of glossopharyngeal, vagus, and accessory nerves. (Tympanic nerve visible in upper right.)
Latin nervus tympanicus
Gray's subject #204 910
To tympanic plexus
Dorlands/Elsevier n_05/12566985

The tympanic nerve (nerve of Jacobson) is a branch of the glossopharyngeal nerve found near the ear.

Contents

It arises from the petrous ganglion, and ascends to the tympanic cavity through a small canal 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.

Jacobson's nerve contains both sensory and secretory fibers.

  • Sensory fibers supply the middle ear and parasympathetic secretory fibers serve the parotid gland.
  • The secretory fibers enter the otic ganglion.

The postganglionic parasympathetic fibers are then distributed via the auriculotemporal nerve (branch of the trigeminal nerve) to the parotid gland.

This nerve may be involved by paraganglioma, in this location referred to as glomus jugulare or glomus tympanicum tumours.

Sympathetic connections of the otic and superior cervical ganglia.

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

 This neuroscience article is a stub. You can help Wikipedia by expanding it.
v • d • e
Nerves of head and neck: the cranial nerves
I-IV olfactory • optic • oculomotor (superior branch, inferior branch) • trochlear
V: trigeminal trigeminal ganglion • ophthalmic • maxillary • mandibular
VI: abducens no significant branches
VII: facial nervus intermedius • geniculate • inside facial canal (greater petrosal, nerve to the stapedius, chorda tympani) • at exit from stylomastoid foramen (posterior auricular, digastric • stylohyoid) • on face (temporal, zygomatic, buccal, mandibular, cervical)
VIII: vestibulocochlear cochlear (striae medullares, lateral lemniscus) • vestibular (Scarpa's ganglion)
IX: glossopharyngeal nucleus ambiguus • ganglia (superior, petrous) • tympanic (tympanic plexus, lesser petrosal) • carotid sinus • pharyngeal branches • pharyngeal plexus
X: vagus ganglia (jugular, nodose) • in the jugular fossa (meningeal branch, auricular branch) • in the neck (pharyngeal branch, superior laryngeal ext and int, recurrent laryngeal, superior cervical cardiac) • in the thorax (inferior cardiac, pulmonary branches, anterior vagal trunk, posterior vagal trunk) • in the abdomen (celiac branches - renal branches - hepatic branches of anterior vagal trunk - anterior gastric branches of anterior vagal trunk - posterior gastric branches of posterior vagal trunk)
XI-XII accessory • hypoglossal
Retrieved from "http://en.wikipedia.org/wiki/Tympanic_nerve"
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