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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.

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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Related Experiment Video

Updated: Apr 4, 2026

Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery

Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery

Published on: August 4, 2023

Nasalance in Cochlear Implantees.

Swapna Sebastian¹, N Sreedevi², Anjali Lepcha¹

¹Department of Otorhinolaryngology, Christian Medical College, Vellore, India.

Clinical and Experimental Otorhinolaryngology

|September 3, 2015

Summary

This summary is machine-generated.

Cochlear implants improve speech nasality in children with profound hearing loss compared to hearing aids, but do not fully normalize speech. Further research is needed to optimize outcomes for cochlear implant users.

Keywords:

Cochlear Implantation Hearing Aid Users Hearing Loss Nasal Air Pressure Speech Intelligibility

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Area of Science:

Speech-Language Pathology
Audiology
Otolaryngology

Background:

Congenital profound hearing loss significantly impacts speech intelligibility and often results in hypernasality.
Cochlear implants offer advanced auditory information compared to traditional hearing aids.
Understanding nasality in hearing-impaired children is crucial for speech development.

Purpose of the Study:

To compare the percentage of nasality in the speech of children using cochlear implants versus hearing aids.
To evaluate speech nasality in cochlear implant users against children with normal hearing.
To assess the effectiveness of cochlear implants in reducing hypernasality.

Main Methods:

Study included three groups: 12 children (4-10 years) with cochlear implants, 12 with hearing aids, and age/sex-matched normal-hearing controls.
All children had prelingual bilateral profound hearing loss and received at least one year of speech therapy.
Nasality was measured by calculating the percentage of nasalance using a specific oral-sound sentence.

Main Results:

Children using hearing aids exhibited a high percentage of nasalance.
Cochlear implant users showed significantly lower nasalance than hearing aid users.
However, the nasalance levels in cochlear implant users did not reach those of normal-hearing children.

Conclusions:

Cochlear implant users demonstrate superior speech quality compared to hearing aid users, with reduced nasality.
Speech acoustics in cochlear implant recipients still deviate from normal, indicating areas for improvement.
Further research should investigate the impact of age at implantation and implant laterality on nasality reduction.