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Related Concept Videos

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...
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.
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.
Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.
Auditory Perception01:17

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...
Brainstem01:19

Brainstem

The brainstem, located inferior to the brain and superior to the spinal cord, serves as a bridge between the cerebrum and the spinal cord. It plays a vital role in relaying information and controlling critical life functions. It comprises three primary regions: the midbrain, pons, and medulla oblongata.
The Midbrain
The midbrain is located beneath the diencephalon and connects the cerebrum with the lower parts of the brain. The cerebral peduncles are prominent midbrain structures that house the...

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Related Experiment Video

Updated: May 15, 2026

Stereotactically-guided Ablation of the Rat Auditory Cortex, and Localization of the Lesion in the Brain
09:29

Stereotactically-guided Ablation of the Rat Auditory Cortex, and Localization of the Lesion in the Brain

Published on: October 11, 2017

Cortical modulation of auditory processing in the midbrain.

Victoria M Bajo1, Andrew J King

  • 1Department of Physiology, Anatomy and Genetics, University of Oxford Oxford, UK.

Frontiers in Neural Circuits
|January 15, 2013
PubMed
Summary
This summary is machine-generated.

Descending auditory pathways, particularly corticofugal projections to the inferior colliculus (IC), significantly modulate auditory processing. These pathways influence neural responses and play a key role in auditory learning and plasticity.

Keywords:
auditory cortexcorticofugaldescending projectioninferior colliculusplasticitysound localization

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Area of Science:

  • Neuroscience
  • Auditory System Research

Background:

  • Sensory systems possess extensive descending projections with poorly understood roles.
  • The auditory system features significant corticofugal projections from the cortex to the inferior colliculus (IC).

Purpose of the Study:

  • To elucidate the function of descending corticofugal projections in auditory processing.
  • To understand how the auditory cortex influences subcortical auditory processing in the IC.

Main Methods:

  • Review of existing literature on corticocollicular pathways.
  • Analysis of studies using electrical stimulation and inactivation of the auditory cortex.
  • Examination of anatomical projections from cortical fields to IC subdivisions.

Main Results:

  • Auditory cortex projections, primarily from layer V pyramidal neurons, target all three IC subdivisions.
  • Corticocollicular projections modulate IC neuron response properties (frequency, intensity, location).
  • These descending pathways are crucial for neural plasticity in auditory learning and experience-dependent perception.

Conclusions:

  • Descending auditory pathways, especially corticofugal projections, are vital for real-time modulation of subcortical auditory processing.
  • These projections enable the spread of cortical plasticity to subcortical nuclei, impacting auditory perception.