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Related Concept Videos

The Cochlea01:13

The Cochlea

41.0K
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

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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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Whole Mount Dissection and Immunofluorescence of the Adult Mouse Cochlea
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Heterogeneous calretinin expression in the avian cochlear nucleus angularis.

S Bloom1, A Williams, K M MacLeod

  • 1Department of Biology, University of Maryland, College Park, MD, 20742, USA.

Journal of the Association for Research in Otolaryngology : JARO
|April 23, 2014
PubMed
Summary
This summary is machine-generated.

Calretinin (CR) expression is heterogeneous in the avian nucleus angularis (NA), suggesting it identifies a distinct neuronal subpopulation. This calcium-binding protein

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Area of Science:

  • Neuroscience
  • Auditory System Research
  • Cellular Biology

Background:

  • Calcium-binding proteins (CaBPs) are vital in neuronal function and often show specific expression patterns.
  • Identifying neuronal subpopulations is crucial for understanding complex neural circuits.
  • The avian nucleus angularis (NA) is analogous to the mammalian ventral cochlear nucleus, featuring diverse cell types.

Purpose of the Study:

  • To investigate the distribution of calretinin (CR)-expressing neurons within the chicken cochlear nucleus.
  • To determine if CR can serve as a marker for specific neuronal subpopulations in the nucleus angularis (NA).

Main Methods:

  • Double immunofluorescence labeling using antibodies against calretinin (CR) and neuronal nuclear protein (NeuN).
  • Quantitative analysis of CR-positive neurons in the nucleus angularis (NA) across different developmental stages (embryonic and postnatal).
  • Assessment of CR expression in relation to the voltage-gated potassium channel Kv1.1.

Main Results:

  • CR expression was homogeneous in cochlear nucleus magnocellularis but heterogeneous in nucleus angularis (NA).
  • A significant inverse correlation was observed between NeuN and CR immunoreactivity in NA neurons.
  • The proportion of CR-positive neurons in NA increased from embryonic stages to postnatal day 8.
  • CR-positive neurons were uniformly distributed in NA by postnatal day 8.
  • CR expression did not correlate with Kv1.1 immunoreactivity.

Conclusions:

  • Calretinin (CR) expression is heterogeneous within the nucleus angularis (NA) of the chicken.
  • CR may serve as a reliable marker to identify a specific subpopulation of neurons within the nucleus angularis.
  • These findings contribute to understanding neuronal diversity in the auditory pathway.