Tympanic nerve

Tympanic nerve
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

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

Contents

Path

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

Jacobson's nerve contains both sensory and secretory fibers.

  • Sensory fibers supply the middle ear.
  • Parasympathetic secretory fibers continue as the Lesser Petrosal nerve and provide secretomotor innervation to the parotid gland. The secretory fibers enter the otic ganglion.
  • Sympathetic fibers (for the large deep petrosal nerve) through communication with the carotid plexus

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

Clinical significance

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

Additional images

External links

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.



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Look at other dictionaries:

  • tympanic nerve — n a branch of the glossopharyngeal nerve arising from the petrosal ganglion and entering the middle ear where it takes part in forming the tympanic plexus called also Jacobson s nerve * * * nervus tympanicus …   Medical dictionary

  • tympanic nerve — noun 1. : a branch of the glossopharyngeal nerve arising from the petrosal ganglion and distributed to the walls of the tympanum of the ear where it takes part in forming a plexus called also Jacobson s nerve 2. : a branch of the facial nerve to… …   Useful english dictionary

  • tympanic plexus — n a nerve plexus of the middle ear that is formed by the tympanic nerve and two or three filaments from the carotid plexus, sends fibers to the mucous membranes of the middle ear, the eustachian tube, and the mastoid cells, and gives off the… …   Medical dictionary

  • Tympanic plexus — Infobox Nerve Name = PAGENAME Latin = plexus tympanicus GraySubject = 204 GrayPage = 909 Caption = View of the inner wall of the tympanum. (Grooves for tympanic plexus labeled at center.) Caption2 = Plan of the facial and intermediate nerves and… …   Wikipedia

  • tympanic canal — noun : a minute canal leading into the middle ear and transmitting the tympanic nerve (sense 1) …   Useful english dictionary

  • Nerve to the stapedius — Nerve: Nerve to the stapedius Latin nervus stapedius Gray s subject #202 904 Innervates Stapedius From facial nerve The Nerve to the Stapedi …   Wikipedia

  • Glossopharyngeal nerve — Nerve: Glossopharyngeal nerve Plan of upper portions of glossopharyngeal, vagus, and accessory nerves …   Wikipedia

  • Nerve — A bundle of fibers that uses electrical and chemical signals to transmit sensory and motor information from one body part to another. See nervous system. * * * A whitish cordlike structure composed of one or more bundles (fascicles) of myelinated …   Medical dictionary

  • Tympanic cavity — Infobox Anatomy Name = PAGENAME Latin = cavitas tympani GraySubject = 230 GrayPage = 1037 Caption = The cochlea and vestibule, viewed from above. (Tympanic cavity labeled at upper right.) Caption2 = MapPos = Tympanic cavity | MapCaption = Bones… …   Wikipedia

  • tympanic membrane — Anat., Zool. eardrum. See diag. under ear. [1855 60] * * * ▪ anatomy also called eardrum,   membrane in the human ear that receives sound vibrations from the outer air and transmits them to the auditory ossicles, which are tiny bones in the… …   Universalium

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