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Related Concept Videos

Brainstem01:19

Brainstem

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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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Hearing01:31

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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.
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Brainstem: Control Centers of Medulla01:21

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The medulla oblongata is a crucial part of the brainstem responsible for controlling various autonomic and involuntary functions. It contains several nuclei, including the olivary, cuneate, gracile, and solitary nuclei.
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The olivary nucleus, or inferior olivary nucleus, is located within the ventrolateral part of the medulla oblongata. It is primarily involved in motor coordination and motor learning. The olivary nucleus receives input from the spinal cord, cerebellum, and motor...
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Auditory Pathway01:15

Auditory Pathway

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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...
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Anatomy of the Ear01:16

Anatomy of the Ear

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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...
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Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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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.
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Related Experiment Video

Updated: Apr 16, 2026

Semi-Automated Analysis of Peak Amplitude and Latency for Auditory Brainstem Response Waveforms Using R
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Semi-Automated Analysis of Peak Amplitude and Latency for Auditory Brainstem Response Waveforms Using R

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Hearing disorders in brainstem lesions.

Gastone G Celesia1

  • 1Department of Neurology, Loyola University of Chicago; Chicago Council for Science and Technology, Chicago, IL, USA.

Handbook of Clinical Neurology
|March 2, 2015
PubMed
Summary
This summary is machine-generated.

Brainstem lesions can cause auditory disorders, affecting up to 57% of cases. Auditory symptoms may be subtle or masked by other neurological deficits, requiring specialized testing.

Keywords:
auditory hallucinationsauditory pathwaysbrainstem auditory systembrainstem strokescerebellopontine angle tumorsdeafnesshearing losshyperacusisneurofibromatosis type 2psychoacoustic testingsound localization

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Neurology

Background:

  • Brainstem lesions frequently disrupt auditory processing, impacting an estimated 57% of individuals.
  • Auditory deficits associated with brainstem diseases are often overshadowed by more prominent neurological symptoms.
  • The location of brainstem lesions dictates the pattern of auditory abnormalities, ranging from ipsilateral to bilateral or even silent deficits.

Purpose of the Study:

  • To elucidate the impact of brainstem lesions on auditory processing.
  • To correlate lesion location within the auditory pathway with specific auditory deficits.
  • To highlight the necessity of advanced psychophysical methods for detecting subtle auditory abnormalities.

Main Methods:

  • Review of auditory processing disruptions caused by brainstem lesions.
  • Analysis of lesion location (e.g., cochlear nuclei, superior olivary complex, lateral lemniscus, inferior colliculus, medial geniculate body) and associated auditory findings.
  • Discussion of psychophysical methods for evaluating central auditory function.

Main Results:

  • Lesions below or within cochlear nuclei cause ipsilateral abnormalities; lesions rostral to cochlear nuclei can lead to bilateral or silent deficits.
  • Disorders of the superior olivary complex and trapezoid body present mixed ipsilateral, contralateral, and bilateral abnormalities.
  • Lesions affecting the lateral lemniscus, inferior colliculus, and medial geniculate body typically cause subtle contralateral abnormalities, often missed by routine testing.

Conclusions:

  • Brainstem lesions significantly impact auditory pathways, with varying clinical presentations based on location.
  • The extensive connectivity and redundancy within the auditory brainstem can render small lesions clinically silent.
  • Specialized psychophysical tests are crucial for diagnosing auditory processing deficits resulting from brainstem lesions, especially when routine testing is inconclusive.