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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...

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...

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.

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.

Auditory Perception

Auditory Perception

The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the cochlea, a...

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Related Experiment Video

Updated: Jul 3, 2026

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

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

Published on: May 10, 2019

Frequency-specific coupling in the cortico-cerebellar auditory system.

M A Pastor¹, C Vidaurre, M A Fernández-Seara

¹Centre for Applied Medical Research, Department of the Neurosciences, University of Navarra School of Medicine, CUN, 31080 Pamplona, Spain. mapastor@unav.es

Journal of Neurophysiology

|August 8, 2008

Summary

This study reveals that 40-Hz auditory stimulation enhances communication between the auditory cortex and the cerebellum. This gamma-band frequency selectively strengthens the connection from the auditory superior temporal gyrus/sulcus to the cerebellum.

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Last Updated: Jul 3, 2026

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

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Published on: May 19, 2016

Area of Science:

Neuroscience
Auditory Neuroscience
Cerebellar Function

Background:

Auditory cortex generates induced oscillatory activity peaking around 40 Hz in humans.
Previous studies confirmed frequency-selective cortical responses to 40-Hz tones and cerebellar activation.

Purpose of the Study:

To investigate the influence of 40-Hz auditory stimulation on the coupling between auditory cortex and cerebellum (Crus II).
To test if 40-Hz selective responses in cerebellar Crus II are due to frequency-specific interactions in the auditory cortico-cerebellar-thalamic loop.

Main Methods:

Functional magnetic resonance imaging (fMRI) was employed.
A dynamic causal model analyzed interactions between medial geniculate nuclei, auditory superior temporal gyrus (STG)/STS, and cerebellar Crus II.
Model comparison was used to assess connectivity.

Main Results:

Functional connectivity between the auditory cortex (STG/STS) and the cerebellum (Crus II) was modulated by 40-Hz auditory stimulation.
Input from the auditory STG/STS to the cerebellum was selectively enhanced at gamma-band frequencies (~40 Hz).

Conclusions:

The auditory cortico-cerebellar-thalamic loop shows frequency-specific modulation.
Enhanced input from the auditory cortex to the cerebellum at 40 Hz explains the selective cerebellar responses observed in this frequency band.