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The Vestibular System

The Vestibular System

The vestibular system is a set of inner ear structures that provide a sense of balance and spatial orientation. This system is comprised of structures within the labyrinth of the inner ear, including the cochlea and two otolith organs—the utricle and saccule. The labyrinth also contains three semicircular canals—superior, posterior, and horizontal—that are oriented on different planes.

Equilibrium and Balance

Equilibrium and Balance

The inner ear assumes dual functionalities of auditory perception and equilibrium maintenance. The vestibule is the organ responsible for balance. This organ contains mechanoreceptors, specifically hair cells, endowed with stereocilia, which aid in deciphering information regarding the position and motion of our heads. Two intrinsic components, the utricle and saccule, help perceive head position, while the semicircular canals track head movement. Neurological messages initiated in the...

The Cochlea

The Cochlea

The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.

Anatomy of the Ear

Anatomy of the Ear

Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...

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Related Experiment Video

Updated: May 21, 2026

Using Unidirectional Rotations to Improve Vestibular System Asymmetry in Patients with Vestibular Dysfunction

Using Unidirectional Rotations to Improve Vestibular System Asymmetry in Patients with Vestibular Dysfunction

Published on: August 30, 2019

[Vestibular dysfunction after cochlear implant in adults].

F Holinski¹, F Elhajzein, G Scholz

¹Klinik für Hals-, Nasen-, Ohrenheilkunde, Charité - Universitätsmedizin Berlin, Campus Charité Mitte, Charitèplatz 1, 10117, Berlin, Deutschland. franca.holinski@charite.de

|June 27, 2012

Summary

Cochlear implant surgery can cause vertigo, but specific techniques minimize risks. Preoperative vestibular function tests are not reliable indicators for predicting post-implant vertigo.

Related Experiment Videos

Last Updated: May 21, 2026

Using Unidirectional Rotations to Improve Vestibular System Asymmetry in Patients with Vestibular Dysfunction

Using Unidirectional Rotations to Improve Vestibular System Asymmetry in Patients with Vestibular Dysfunction

Published on: August 30, 2019

Area of Science:

Otolaryngology
Neurosurgery
Vestibular Science

Background:

Clinical vertigo is a known complication following cochlear implant (CI) surgery, with reported incidence rates varying widely.
Peripheral vestibular function loss also occurs frequently in CI patients.

Purpose of the Study:

To evaluate the incidence of clinical vertigo and vestibular function loss after cochlear implantation using specific surgical techniques.
To determine if preoperative vestibular function predicts postoperative vertigo.

Main Methods:

30 adult patients underwent 41 cochlear implantations with a Nucleus Freedom CI between 2006 and 2009.
Cochleostomy was performed anterocaudal to the round window, with electrode insertion via the "off-stylet" technique into the scala tympani.

Main Results:

Clinical vertigo occurred in 24.4% of operations, with varying onset times (acute, continuous, delayed).
Vestibular organ function loss was observed in 11.1% of cases via calorimetry.
A higher incidence of vertigo was noted in patients with preoperative diminished vestibular function, though not statistically significant.

Conclusions:

The surgical techniques and materials used can minimize the risk of vestibular function loss and clinical vertigo.
Preoperative vestibular function tests are not predictive of postoperative vertigo incidence.
In cases of unilateral preoperative vestibular dysfunction, implantation of the contralateral, normally functioning ear is recommended.