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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.

Sound Waves: Resonance

Sound Waves: Resonance

Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...

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...

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.

Double Resonance Techniques: Overview

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...

Concept of Resonance and its Characteristics

Concept of Resonance and its Characteristics

If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not...

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Related Experiment Video

Updated: Feb 26, 2026

Cochlear Surface Preparation in the Adult Mouse

Cochlear Surface Preparation in the Adult Mouse

Published on: November 6, 2019

Short-wave world revisited: Resonance in a two-dimensional cochlear model.

¹Physics Laboratory, Ear, Nose and Throat Clinic, Wilhelmina Hospital, Amsterdam, The Netherlands.

Hearing Research

|February 25, 2026

Summary

This study analyzes two-dimensional fluid motion in the cochlea's resonance region. Findings show this motion is predominantly two-dimensional, offering insights into cochlear mechanics.

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Last Updated: Feb 26, 2026

Cochlear Surface Preparation in the Adult Mouse

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Published on: November 6, 2019

Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea

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Published on: May 10, 2019

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Area of Science:

Auditory Neuroscience
Fluid Dynamics
Bioengineering

Background:

The cochlea's function involves complex wave motion, divisible into three regions based on wave behavior.
Understanding fluid dynamics within the cochlea is crucial for explaining auditory processing.

Purpose of the Study:

To investigate the two-dimensional aspects of wave motion in the cochlea's resonance region.
To analyze fluid motion using a simplified cochlear model with location-dependent impedance.

Main Methods:

Approximation of partition impedance as a linear function of location (χ).
Analytical solution of the integral equation governing two-dimensional fluid motion.
Examination of wave motion characteristics within the cochlea's resonance zone.

Main Results:

Fluid wave motion in the resonance region is predominantly two-dimensional.
This motion is characterized as a 'short-wave world' scenario.
The study discusses various physical aspects of this specific fluid motion.

Conclusions:

The resonance region of the cochlea exhibits primarily two-dimensional fluid wave motion.
This finding contributes to a deeper understanding of cochlear mechanics and auditory signal processing.
The simplified model provides valuable insights into the complex biophysics of hearing.