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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.

Hearing

Hearing

When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.

The Auditory Ossicles

The Auditory Ossicles

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.
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...

Hair Cells

Hair Cells

Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.

Auditory Pathway

Auditory Pathway

Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...

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: Jun 3, 2026

Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention

Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention

Published on: December 20, 2024

The future of bone conduction hearing devices.

Bo Håkansson¹

¹Department of Signals and Systems, Chalmers University of Technology, Göteborg, Sweden.

Advances in Oto-Rhino-Laryngology

|March 11, 2011

Summary

New bone conduction hearing solutions avoid skin penetration, addressing drawbacks of current bone-anchored hearing aids (Baha). These alternatives, including bone conduction implants (BCI), aim to improve patient outcomes and reduce complications.

Area of Science:

Audiology
Biomedical Engineering
Otolaryngology

Background:

Bone-anchored hearing aids (Baha) are effective for mixed/conductive hearing loss and single-sided deafness.
Current Baha systems have drawbacks: skin infections, implant loss, and patient stigma.
There is a need for improved bone conduction hearing solutions.

Purpose of the Study:

To discuss alternatives to Baha that minimize drawbacks.
To explore future improvements in bone conduction devices.
To present advances in bone conduction implant (BCI) systems.

Main Methods:

Review of alternative bone conduction devices: improved conventional BC devices, BC implants (BCI), and dental-attached devices.
Discussion of potential future improvements for direct BC devices.

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Enhanced Cochlear Coverage and Hearing Preservation in High-Frequency Hearing Loss via Electric Acoustic Stimulation with Longer Electrode

Enhanced Cochlear Coverage and Hearing Preservation in High-Frequency Hearing Loss via Electric Acoustic Stimulation with Longer Electrode

Published on: October 11, 2024

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Last Updated: Jun 3, 2026

Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention

Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention

Published on: December 20, 2024

Enhanced Cochlear Coverage and Hearing Preservation in High-Frequency Hearing Loss via Electric Acoustic Stimulation with Longer Electrode

Enhanced Cochlear Coverage and Hearing Preservation in High-Frequency Hearing Loss via Electric Acoustic Stimulation with Longer Electrode

Published on: October 11, 2024

Presentation of a novel BCI system with non-screw attachment.

Main Results:

Alternative devices aim to eliminate the need for permanent skin penetration.
Direct BC devices offer superior high-frequency sound quality.
Preclinical studies suggest new BCI systems may match or exceed Baha performance.

Conclusions:

Alternative bone conduction technologies show promise in overcoming Baha limitations.
BC implants, particularly those with novel attachment methods, represent a significant advancement.
Future developments focus on enhancing sound quality and patient experience in hearing rehabilitation.