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Related Concept Videos

Auditory Pathway01:15

Auditory Pathway

8.5K
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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Glial Cells01:04

Glial Cells

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Overview
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Nervous Tissue: Glial Cells01:31

Nervous Tissue: Glial Cells

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Glia, or neuroglia, are vital support cells that assist neurons in their functions. The term "glia" originates from the Greek word for "glue," reflecting their role in holding the nervous system together. These cells can be categorized into six types: four in the central nervous system (CNS) and two in the peripheral nervous system (PNS).
The CNS glial cell includes the astrocytes, the oligodendrocytes, the microglia, and the ependymal cells.
Astrocytes are star-shaped glial...
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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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The Cochlea01:13

The Cochlea

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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.
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Hair Cells01:22

Hair Cells

46.2K
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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Selective Tracing of Auditory Fibers in the Avian Embryonic Vestibulocochlear Nerve
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Glial Cell Contributions to Auditory Brainstem Development.

Karina S Cramer1, Edwin W Rubel2

  • 1Department of Neurobiology and Behavior, University of California, Irvine Irvine, CA, USA.

Frontiers in Neural Circuits
|November 8, 2016
PubMed
Summary
This summary is machine-generated.

Glial cells are crucial for auditory brainstem development, influencing neuronal circuits and sound localization. This review highlights astrocytes, oligodendrocytes, and microglia roles in auditory pathway maturation.

Keywords:
astrocytecalyx of Helddelay linemedial nucleus of the trapezoid bodymicroglianucleus laminarisnucleus magnocellularisoligodendrocyte

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Auditory Neuroscience

Background:

  • Glial cells were historically viewed as solely supportive in the central nervous system.
  • Emerging evidence reveals glial cells actively contribute to neuronal circuit function and development.
  • Auditory pathways in the brainstem are critical for precise sound source localization.

Purpose of the Study:

  • To review the role of glial cells in the development of auditory brainstem pathways.
  • To explore the specific contributions of astrocytes, oligodendrocytes, and microglia.
  • To understand how non-neuronal cells shape specialized auditory circuits.

Main Methods:

  • Review of existing literature on glial cell function in auditory brainstem development.
  • Analysis of studies in both avian and mammalian models.
  • Examination of glial cell interactions with neuronal components.

Main Results:

  • Distinct astrocyte populations influence auditory brainstem maturation, spatial organization, synaptogenesis, and dendritic growth.
  • Oligodendrocytes are vital for precise myelination, crucial for auditory timing and interaural cue processing.
  • Microglia appear early in development and may aid in auditory pathway maturation.

Conclusions:

  • Glial cells are essential, non-neuronal contributors to the assembly of specialized auditory brainstem circuits.
  • Astrocytes, oligodendrocytes, and microglia play distinct and critical roles in auditory pathway development.
  • Understanding glial contributions is key to comprehending auditory circuit formation and function.