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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...

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.

Perceiving Loudness, Pitch, and Location

Perceiving Loudness, Pitch, and Location

The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...

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Related Experiment Video

Updated: Jul 16, 2026

Spiral Ganglion Neuron Explant Culture and Electrophysiology on Multi Electrode Arrays

Spiral Ganglion Neuron Explant Culture and Electrophysiology on Multi Electrode Arrays

Published on: October 19, 2016

Frequency map for the human cochlear spiral ganglion: implications for cochlear implants.

Olga Stakhovskaya¹, Divya Sridhar, Ben H Bonham

¹Epstein Laboratory, Department of Otolaryngology-Head and Neck Surgery, University of California San Francisco, San Francisco, CA 94143-0526, USA. ostakhovskaya@ohns.ucsf.edu

Journal of the Association for Research in Otolaryngology : JARO

|February 24, 2007

Summary

This study maps human cochlear spiral ganglion (SG) frequencies to organ of Corti (OC) locations, revealing significant individual variability. Basal coil diameter can predict cochlear dimensions, aiding cochlear implant design.

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Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion

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Published on: January 17, 2025

Area of Science:

Neuroscience
Auditory Neuroscience
Otoacoustic Emissions

Background:

Accurate cochlear frequency mapping is crucial for understanding auditory processing and designing effective cochlear implants.
Existing methods often rely on cochlear length, which is difficult to measure non-invasively.
Individual variability in cochlear anatomy necessitates personalized approaches.

Purpose of the Study:

To derive a frequency-position function for the human cochlear spiral ganglion (SG) and organ of Corti (OC).
To quantify individual variability in cochlear frequency mapping.
To evaluate basal coil diameter as a predictor of cochlear dimensions for surgical planning.

Main Methods:

Microdissection and surface preparation of 9 cadaver cochleae.
Digital imaging and measurement of the OC and SG.
Tracing of radial nerve fibers to establish frequency-matched coordinates.
Correlation of basal coil diameter with OC and SG lengths.

Main Results:

A mathematical function was derived to relate frequency representation along the OC to the SG.
Estimated critical band distance in the SG varied significantly along the spiral.
Basal coil diameter showed potential for predicting OC/SG length and surgical insertion depth.

Conclusions:

The study provides a novel frequency map for the human SG and OC, accounting for individual variability.
Basal coil diameter offers a practical metric for estimating cochlear dimensions in preoperative imaging.
Findings have direct implications for optimizing cochlear implant design and surgical procedures.