Vestibular nerve

Vestibular nerve
Nerve: Vestibular nerve
Inner ear illustration showing semicircular canal, hair cells, ampulla, cupula, vestibular nerve, & fluid
Terminal nuclei of the vestibular nerve, with their upper connections. (Schematic.)
1. Cochlear nerve, with its two nuclei.
2. Accessory nucleus.
3. Tuberculum acusticum.
4. Vestibular nerve.
5. Internal nucleus.
6. Nucleus of Deiters.
7. Nucleus of Bechterew.
8. Inferior or descending root of acoustic.
9. Ascending cerebellar fibers.
10. Fibers going to raphé.
11. Fibers taking an oblique course.
12. Lemniscus.
13. Inferior sensory root of trigeminal.
14. Cerebrospinal fasciculus.
15. Raphé.
16. Fourth ventricle.
17. Inferior peduncle. Origin of striæ medullares.
Latin nervus vestibularis
Gray's subject #203 906
From Vestibulocochlear nerve
MeSH Vestibular+Nerve

The vestibular nerve is one of the two branches of the Vestibulocochlear nerve (the cochlear nerve being the other). It goes to the semicircular canals via the vestibular ganglion. It receives positional information.

Axons of the vestibular nerve synapse in the vestibular nucleus on the lateral floor and wall of the fourth ventricle in the pons and medulla.

It arises from bipolar cells in the vestibular ganglion, ganglion of Scarpa, which is situated in the upper part of the outer end of the internal auditory meatus.

Contents

Branches

The peripheral fibers divide into three branches (some sources list two)[1]:

  • the superior branch passes through the foramina in the area vestibularis superior and ends in the utricle and in the ampullae of the superior and lateral semicircular ducts;
  • the fibers of the inferior branch traverse the foramina in the area vestibularis inferior and end in the saccule;
  • the posterior branch runs through the foramen singulare and supplies the ampulla of the posterior semicircular duct.

See also

Additional images

  • Illustration of otolith organs

References

  1. ^ eMedicine - Anatomy of the Vestibular System : Article by Steve C Lee

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 As such, some of the information contained within it may be outdated.

v · d · eNerves of head and neck: the cranial nerves and nuclei (TA A14.2.01, GA 9.855)
olfactory (AON->I)
optic (LGN->II)
oculomotor
(ON, EWN->III)
trochlear (TN->IV)
no significant branches
trigeminal
(PSN, TSN, MN, TMN->V)
abducens (AN->VI)
no significant branches
facial (FMN, SN, SSN->VII)
near origin
vestibulocochlear
(VN, CN->VIII)
glossopharyngeal
(NA, ISN, SN->IX)
ganglia (superior, inferior)
vagus
(NA, DNVN, SN->X)
ganglia (superior, inferior)
accessory (NA, SAN->XI)
hypoglossal (HN->XII)

M: PNS

anat(h/r/t/c/b/l/s/a)/phys(r)/devp/prot/nttr/nttm/ntrp

noco/auto/cong/tumr, sysi/epon, injr

proc, drug(N1B)
v · d · eSensory system: Auditory and Vestibular systems (TA A15.3, TH 3.11.09, GA 10.1029)
Outer ear

Pinna (Helix, Antihelix, Tragus, Antitragus, Incisura anterior auris, Earlobe) • Ear canal • Auricular muscles

Eardrum (Umbo, Pars flaccida)
Middle ear

Labyrinthine wall/medial: Oval window · Round window • Secondary tympanic membrane • Prominence of facial canal • Promontory of tympanic cavity

Membranous wall/lateral

Mastoid wall/posterior: Mastoid cells • Aditus to mastoid antrum • Pyramidal eminence

Carotid wall/anterior

Tegmental wall/roof: Epitympanic recess

Jugular wall/floor
Stapedius · Tensor tympani
Bony part of pharyngotympanic tube · Cartilage of pharyngotympanic tube (Torus tubarius)
Inner ear/
(membranous labyrinth,
bony labyrinth)
General cochlea
Perilymphatic space

Reissner's/vestibular membrane • Basilar membrane

Endolymph • Stria vascularis • Spiral ligament

Organ of Corti: Stereocilia • Tectorial membrane • Sulcus spiralis (externus, internus) • Spiral limbus
Cells

M: EAR

anat(e/p)/phys/devp

noco/cong, epon

proc, drug(S2)
v · d · eAuditory and vestibular pathways
Auditory
Vestibular

M: EAR

anat(e/p)/phys/devp

noco/cong, epon

proc, drug(S2)



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