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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

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...

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Related Experiment Video

Updated: May 25, 2026

Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion

Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion

Published on: January 17, 2025

When do we choose the 'better balance' ear for cochlear implants?

Sarah C Hugh¹, David B Shipp, Joseph M Chen

¹University of Toronto, Toronto, Ontario, Canada.

Cochlear Implants International

|January 19, 2012

Summary

Cochlear implant surgery typically favors the ear with poorer vestibular function. However, this study found that 27% of patients with asymmetric responses were implanted in the better-balanced ear due to anatomical, functional, or patient preference factors.

Related Experiment Videos

Last Updated: May 25, 2026

Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion

Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion

Published on: January 17, 2025

Area of Science:

Otolaryngology
Neurosurgery
Audiology

Background:

Cochlear implantation conventionally targets the ear with diminished vestibular function, minimizing risks of iatrogenic labyrinthine injury.
Electronystagmography (ENG) is used to assess vestibular function and guide surgical ear selection.

Observation:

A retrospective review of 724 cochlear implant patients revealed 18% had asymmetric vestibular responses via ENG.
Of these, 35 patients (27%) received implants in the ear with better vestibular function.

Findings:

Reasons for implanting the 'better balance' ear included anatomical contraindications, pursuit of binaural hearing, avoidance of severely deprived auditory pathways, and patient preference.
These factors indicate a nuanced approach to cochlear implant side selection beyond solely vestibular status.

Implications:

The findings necessitate an updated algorithm for cochlear implant ear selection, considering multiple clinical factors.
Further research is recommended to validate this refined surgical planning approach.