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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.

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...

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 10, 2026

Robotic Cochlear Implantation for Direct Cochlear Access

Robotic Cochlear Implantation for Direct Cochlear Access

Published on: June 16, 2022

Cochlear otosclerosis.

Sebahattin Cureoglu¹, Muzeyyen Y Baylan, Michael M Paparella

¹Department of Otolaryngology, University of Minnesota, Minneapolis, Minnesota, USA.

Current Opinion in Otolaryngology & Head and Neck Surgery

|August 10, 2010

Summary

This summary is machine-generated.

Cochlear otosclerosis involves unique bone remodeling in the otic capsule, potentially causing hearing loss. Research advances focus on understanding its molecular triggers and clinical impact.

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Area of Science:

Otolaryngology
Otopathology
Skeletal Biology

Background:

Otosclerosis is a bone remodeling disease affecting the otic capsule.
This remodeling is unique to the otic capsule, unlike other skeletal sites.
Genetic and environmental factors are implicated in its development.

Purpose of the Study:

To review current research and clinical findings in cochlear otosclerosis.
To summarize advances in understanding the pathophysiology of otosclerosis.
To highlight the clinical implications of cochlear otosclerosis.

Main Methods:

Literature review of recent studies on cochlear otosclerosis.
Analysis of research on bone remodeling mechanisms in the otic capsule.
Synthesis of clinical data regarding hearing loss and stapes fixation.

Main Results:

Otosclerosis is characterized by specific bone remodeling of the otic capsule.
Molecular factors trigger otic capsule remodeling in susceptible individuals.
Cochlear involvement, particularly of the endosteum, is associated with sensorineural or mixed hearing loss.

Conclusions:

Cochlear otosclerosis is defined by otic capsule involvement affecting the cochlear endosteum.
This condition leads to sensorineural or mixed hearing loss.
Severe cochlear otosclerosis often results in stapes fixation.