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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...

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Related Experiment Video

Updated: Jul 3, 2026

Robotic Cochlear Implantation for Direct Cochlear Access

Robotic Cochlear Implantation for Direct Cochlear Access

Published on: June 16, 2022

Cochlear implants: a remarkable past and a brilliant future.

Blake S Wilson¹, Michael F Dorman

¹Division of Otolaryngology, Head and Neck Surgery, Department of Surgery, Duke University Medical Center, Durham, NC 27710, USA. blake.wilson@duke.edu

Hearing Research

|July 12, 2008

Summary

This summary is machine-generated.

Cochlear implants improve hearing, but challenges remain in noisy environments. Future research and technologies like bilateral implants offer promise for enhanced speech understanding.

Related Experiment Videos

Last Updated: Jul 3, 2026

Robotic Cochlear Implantation for Direct Cochlear Access

Robotic Cochlear Implantation for Direct Cochlear Access

Published on: June 16, 2022

Area of Science:

Biomedical Engineering
Neuroscience
Audiology

Background:

Cochlear implant technology has advanced significantly, enabling speech understanding in quiet environments for many users.
Current cochlear implant recipients achieve varying levels of speech comprehension, with 'average' users facing difficulties in complex listening situations.

Observation:

Despite technological progress, average cochlear implant users struggle in typical workplace environments.
Even advanced users experience significant challenges with speech understanding in noisy conditions.

Findings:

Limitations include loss of low-frequency information due to signal processing, reduced effective stimulation channels from electrode field overlap, and central processing deficits.
Bilateral cochlear implants and combined electric/acoustic stimulation show potential for improving noise performance and restoring low-frequency information.

Implications:

Future research directions include developing advanced signal processing and novel electrode technologies, such as drug-eluting electrodes, to further enhance auditory perception.
These advancements hold promise for significantly improving the quality of life for individuals with hearing loss through better cochlear implant functionality.