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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.

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.

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...

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Related Experiment Video

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The Miniature Pig: A Large Animal Model for Cochlear Implant Research

The Miniature Pig: A Large Animal Model for Cochlear Implant Research

Published on: July 28, 2022

Modelling cochlear mechanics.

Guangjian Ni¹, Stephen J Elliott¹, Mohammad Ayat²

¹Institute of Sound and Vibration Research, University of Southampton, Southampton SO17 1BJ, UK.

Biomed Research International

|August 20, 2014

Summary

This review explores numerical modeling of cochlear mechanics and electrical processes. It aids in understanding hearing and predicting experimental outcomes for the cochlea, crucial for mammal hearing.

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Area of Science:

* Auditory Neuroscience
* Bioengineering
* Computational Biology

Background:

* The cochlea is vital for mammalian hearing, converting sound frequencies into neural signals via basilar membrane (BM) vibrations.
* Sound-induced pressure differences in cochlear fluids cause BM deflections, which are detected by hair cells.
* Understanding cochlear mechanics is essential for interpreting experimental data and predicting future findings.

Purpose of the Study:

* To review numerical modeling approaches for cochlear mechanical and electrical processes.
* To highlight the importance of modeling in advancing auditory research.
* To cover key aspects including fluid coupling, micromechanics, and electrical coupling.

Main Methods:

* Review of existing literature on numerical modeling of cochlear functions.
* Focus on models encompassing fluid dynamics, structural mechanics, and electrophysiology.
* Analysis of models addressing the cochlear amplifier and nonlinear phenomena.

Main Results:

* Numerical models provide insights into the complex interplay of mechanical and electrical events in the cochlea.
* Modeling aids in understanding frequency mapping along the basilar membrane.
* These models help interpret the function of the cochlear amplifier and nonlinearities.

Conclusions:

* Numerical modeling is a powerful tool for studying cochlear mechanics and electrical coupling.
* Continued development of models will enhance our understanding of hearing and auditory disorders.
* Modeling facilitates the prediction of experimental outcomes, guiding future research directions.