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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.

Auditory Pathway

Auditory Pathway

Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...

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...

The Bone Matrix

The Bone Matrix

Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in acid or...

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.

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.

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Related Experiment Video

Updated: May 10, 2026

Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention

Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention

Published on: December 20, 2024

Bone conduction: an explanation for this phenomenon comprising complex mechanisms.

¹Service d'ORL et de chirurgie cervico-faciale, université Bordeaux-Segalen, centre F.-X. Michelet, groupe hospitalier Pellegrin, CHU de Bordeaux, place Amélie-Raba-Léon, 33076 Bordeaux cedex, France.

European Annals of Otorhinolaryngology, Head and Neck Diseases

|June 8, 2013

Summary

This summary is machine-generated.

Bone conduction hearing uses vibrations to stimulate the inner ear. Understanding these pathways is key to accurately assessing cochlear function and hearing loss.

Keywords:

Air conduction Basilar membrane Bone conduction Compression Hearing Inertia Phantom curve Travelling wave

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Area of Science:

Audiology
Neuroscience
Bioengineering

Background:

Bone conduction hearing involves basilar membrane vibration due to pressure gradients.
This vibration can be induced intentionally (bone vibrator) or unintentionally during air conduction tests.
Understanding bone conduction pathways is crucial for accurate hearing assessments.

Purpose of the Study:

To elucidate the mechanisms and pathways involved in bone conduction hearing.
To differentiate between direct and indirect stimulation of the cochlea via bone conduction.

Main Methods:

Analysis of vibration transmission pathways to the basilar membrane.
Categorization of bone conduction pathways into middle ear bypassing and middle ear involving routes.

Main Results:

Bone conduction pathways bypass the middle ear through cochlear fluid inertia, cochlear wall compression, and cerebrospinal fluid pressure.
Alternative pathways involve transmission through the middle or outer ear.
Precise contribution of each pathway remains challenging to quantify.

Conclusions:

Bone conduction testing provides a reliable method for directly assessing cochlear function.
Knowledge of these pathways aids in interpreting audiological test results.
Further research may refine the understanding of individual pathway contributions.