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Related Concept Videos

Equilibrium and Balance01:15

Equilibrium and Balance

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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...
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The Vestibular System01:29

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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.
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Auditory Perception01:17

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The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the...
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Anatomy of the Ear01:16

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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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The Cochlea01:13

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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.
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The Auditory Ossicles01:11

The Auditory Ossicles

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The auditory ossicles of the middle ear transmit sounds from the air as vibrations to the fluid-filled cochlea. The auditory ossicles consist of two malleus (hammer) bones, two incus (anvil) bones, and two stapes (stirrups), one on each side. These bones develop during the fetal stage and are the ones to ossify first. They are fully mature at birth and do not grow afterward.
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Related Experiment Video

Updated: Jun 27, 2025

Using Unidirectional Rotations to Improve Vestibular System Asymmetry in Patients with Vestibular Dysfunction
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Bone-Anchored Hearing Aid Effects on Vestibular Function: A Preliminary Report.

Federica Pollastri1, Beatrice Giannoni1,2, Vincenzo Marcelli3

  • 1Unit of Audiology, Careggi University Hospital, Largo Brambilla 3, 50134 Florence, Italy.

Audiology Research
|April 26, 2024
PubMed
Summary

Bone-anchored hearing aids stimulate the vestibular system, causing nystagmus in patients. This sound-evoked nystagmus suggests peripheral vestibular activation, primarily affecting the utricle and lateral semicircular canal.

Keywords:
bone-anchored hearing aidsbone-conducted per-vibratory stimulusskull vibration-induced nystagmusskull vibration-induced nystagmus test

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Area of Science:

  • Neuroscience
  • Otolaryngology
  • Audiology

Background:

  • Cochlear receptors are sensitive to vibratory stimuli, leading to the development of bone-anchored hearing aids (BAHA) for hearing loss.
  • The vestibular system also responds to vibratory stimuli, a principle used in clinical vestibular function testing.
  • The potential interaction between vibratory stimuli from BAHA and vestibular function was unexplored.

Purpose of the Study:

  • To investigate whether bone vibration from BAHA influences vestibular system functionality.
  • To determine if acoustic stimulation via bone conduction can elicit vestibular responses.

Main Methods:

  • Recruited 12 patients with a bone-anchored hearing aid.
  • Evaluated vestibular function with and without the activated vibratory acoustic device.

Main Results:

  • Vibratory stimulus from the bone conduction aid reached and stimulated vestibular receptors, evidenced by nystagmus changes during testing.
  • No patients reported dizziness or vertigo during prosthesis use.
  • Induced nystagmus was predominantly horizontal, unidirectional, gaze-inhibited, and consistent with peripheral vestibular damage.

Conclusions:

  • Sound-evoked nystagmus suggests peripheral, rather than central, vestibular activation.
  • The characteristics of the induced nystagmus point to activation of the utricle and lateral semicircular canal.