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Related Concept Videos

The Cochlea01:13

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 Pathway01:15

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 Location01:21

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...
Hearing01:31

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.
Neural Circuits01:25

Neural Circuits

Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
Hair Cells01:22

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: Jun 18, 2026

Selective Tracing of Auditory Fibers in the Avian Embryonic Vestibulocochlear Nerve
11:27

Selective Tracing of Auditory Fibers in the Avian Embryonic Vestibulocochlear Nerve

Published on: March 18, 2013

Innervation Pattern of Inhibitory Projection Neurons in the Bird Sound Localization Circuit.

Kathryn M Tabor1,2,3, Rachel O L Wong3, Edwin W Rubel1,2

  • 1Virginia Merrill Bloedel Hearing Research Center, Department of Otolaryngology-Head and Neck Surgery, University of Washington, Seattle, Washington, USA.

The Journal of Comparative Neurology
|June 17, 2026
PubMed
Summary
This summary is machine-generated.

Inhibitory neurons from the superior olivary nucleus (SON) broadly innervate the nucleus laminaris (NL), enabling accurate sound localization across varying intensities. This broad innervation shapes neural activity for robust interaural time difference (ITD) detection.

Keywords:
inhibitory arborizationinteraural time differencesnucleus laminarissound localization circuitrysuperior olivary nucleus

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Last Updated: Jun 18, 2026

Selective Tracing of Auditory Fibers in the Avian Embryonic Vestibulocochlear Nerve
11:27

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Slicing the Embryonic Chicken Auditory Brainstem to Evaluate Tonotopic Gradients and Microcircuits
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In Vitro Wedge Slice Preparation for Mimicking In Vivo Neuronal Circuit Connectivity
10:31

In Vitro Wedge Slice Preparation for Mimicking In Vivo Neuronal Circuit Connectivity

Published on: August 18, 2020

Area of Science:

  • Neuroscience
  • Auditory System
  • Computational Neuroscience

Background:

  • Animals use temporal and intensity cues from sound for environmental navigation.
  • The nucleus laminaris (NL) in birds detects interaural time differences (ITDs) for sound localization.
  • Inhibitory neurons from the superior olivary nucleus (SON) are crucial for maintaining NL neuron sensitivity to ITDs across sound intensities.

Purpose of the Study:

  • To investigate the organization and innervation pattern of inhibitory inputs from SON neurons to the NL.
  • To understand how SON's inhibitory projections contribute to ITD detection mechanisms in the auditory pathway.

Main Methods:

  • Analysis of individual axon innervation patterns from SON neurons within the chicken NL.
  • Characterization of SON axonal arbor size, topographic organization, and synaptic distribution.

Main Results:

  • SON axonal arborizations exhibit significant variation in size and organization.
  • SON neurons innervate larger target regions in the NL compared to excitatory inputs from nucleus magnocellularis (NM), spanning broader tonotopic and ITD axes.
  • Most SON neurons innervate both dendritic laminae and somata of NL neurons, unlike NM axons confined to a single lamina.

Conclusions:

  • The broad innervation pattern of SON neurons allows for widespread control over NL neuron activity.
  • This widespread inhibition supports accurate ITD detection across a wide range of sound intensities and environments.
  • SON neurons also project collaterally to NM and nucleus angularis, suggesting complex integration within the auditory pathway.