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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.

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.

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 21, 2026

The Mouse Round-window Approach for Ototoxic Agent Delivery: A Rapid and Reliable Technique for Inducing Cochlear Cell Degeneration

The Mouse Round-window Approach for Ototoxic Agent Delivery: A Rapid and Reliable Technique for Inducing Cochlear Cell Degeneration

Published on: November 26, 2015

Ischemic tolerance in the cochlea.

Shoichiro Takeda¹, Ryuji Hata, Fang Cao

¹Department of Otolaryngology, Ehime University Graduate School of Medicine, Shitsukawa, Ehime, Japan.

Neuroscience Letters

|July 15, 2009

Summary

This summary is machine-generated.

Sublethal cochlear ischemia preconditioning protected against hearing loss and hair cell damage from lethal ischemia in gerbils. This demonstrates cochlear ischemic tolerance, a potential therapeutic target.

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Area of Science:

Neuroscience
Otolaryngology
Physiology

Background:

Cochlear ischemia can lead to irreversible hearing loss and hair cell degeneration.
Understanding mechanisms of cochlear protection is crucial for developing therapeutic strategies.

Purpose of the Study:

To investigate the phenomenon of ischemic tolerance in the cochlea.
To determine if sublethal cochlear ischemia can protect against subsequent lethal ischemia.

Main Methods:

A gerbil model of cochlear ischemia was established using bilateral vertebral artery occlusion.
Animals were divided into single (lethal ischemia) and double (sublethal followed by lethal ischemia) groups.
Hair cell survival and hearing function were assessed after ischemic events.

Main Results:

Sublethal ischemia (2 min) significantly prevented hair cell degeneration caused by lethal ischemia (15 min).
Hearing impairment was ameliorated in gerbils subjected to sublethal preconditioning.
These findings indicate the presence of ischemic tolerance in the cochlea.

Conclusions:

Preconditioning with sublethal cochlear ischemia induces a protective state, conferring tolerance to subsequent lethal ischemia.
This ischemic tolerance phenomenon offers a potential avenue for preventing hearing loss due to cochlear ischemia.
Further research could explore the molecular pathways underlying cochlear ischemic tolerance.