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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...

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.

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...

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.

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Related Experiment Video

Updated: Jul 11, 2026

Evaluation of Auditory Brainstem Response in Chicken Hatchlings

Evaluation of Auditory Brainstem Response in Chicken Hatchlings

Published on: April 1, 2022

Beyond timing in the auditory brainstem: intensity coding in the avian cochlear nucleus angularis.

Katrina M MacLeod¹, Catherine E Carr

¹Department of Biology, University of Maryland, College Park, MD 20742, USA. macleod@umd.edu

Progress in Brain Research

|October 11, 2007

Summary

This summary is machine-generated.

Avian brain studies reveal how the nucleus angularis (NA) processes sound intensity. Short-term synaptic plasticity in NA is key to separating intensity and timing information for auditory processing.

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Evaluation of Auditory Brainstem Response in Chicken Hatchlings

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Published on: June 9, 2017

Area of Science:

Neuroscience
Auditory Neuroscience
Computational Neuroscience

Background:

Computational principles for sound localization often stem from avian brain research, particularly for interaural timing differences.
Understanding neural codes for interaural level differences and other intensity-related sound processing remains less developed.
The cochlear nucleus angularis (NA) in birds serves as a critical relay for intensity processing.

Purpose of the Study:

To present current knowledge on cell types within the avian NA.
To describe their responses to auditory stimuli and potential coding roles.
To explore the role of short-term synaptic plasticity in information processing within the NA.

Main Methods:

Experimental studies on avian NA.
Computational modeling of synaptic plasticity in NA.
Analysis of NA projections to brain stem and midbrain targets.

Main Results:

Identified diverse cell types in NA and their auditory response properties.
Demonstrated that short-term synaptic plasticity in NA is crucial for segregating intensity and timing information into parallel pathways.
Revealed projections from NA to at least four distinct brain stem and midbrain targets.

Conclusions:

The NA plays a significant role in the parallel processing of auditory intensity and timing information.
NA's connectivity suggests involvement in various complex sound processing circuits.
Comparative studies with mammalian cochlear nucleus can elucidate conserved and species-specific auditory processing mechanisms.