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Related Concept Videos

The Cochlea01:13

The Cochlea

52.2K
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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Hearing01:31

Hearing

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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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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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Encoding01:19

Encoding

965
Information enters the brain through encoding, which is the input of information into the memory system. Once sensory information is received from the environment, the brain labels or codes it. The information is then organized with similar information and connected to existing concepts. Encoding occurs through automatic processing and effortful processing.
Automatic processing involves the encoding of details like time, space, frequency, and the meaning of words, usually done without conscious...
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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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Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
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Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

Published on: March 24, 2023

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New insights into cochlear sound encoding.

Tobias Moser1, Christian Vogl2

  • 1Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, Göttingen, Germany; Auditory Neuroscience Group, Max-Planck-Institute for Experimental Medicine, Göttingen, Germany; Synaptic Nanophysiology Group, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany; Auditory Neuroscience and Optogenetics Group, German Primate Center, Göttingen, Germany.

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|September 17, 2016
PubMed
Summary
This summary is machine-generated.

Inner ear synapses use unique presynaptic molecules like RIBEYE and otoferlin for precise sound transmission. Research explores vesicle release and calcium channel coupling for auditory function.

Keywords:
inner hair cellotoferlinsynaptic ribbon

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Cell Biology

Background:

  • Inner ear synapses transmit sound information from hair cells to spiral ganglion neurons with high speed and precision.
  • These synapses utilize specialized presynaptic molecular components to achieve their demanding function.
  • Key components include the synaptic ribbon (RIBEYE) and otoferlin, crucial for vesicle release and auditory function.

Purpose of the Study:

  • To provide an update on the current understanding of sound encoding in the cochlea.
  • To focus on the presynaptic mechanisms underlying auditory information transmission.
  • To discuss the molecular composition and functional peculiarities of hair cell synapses.

Main Methods:

  • This is a commentary, not an experimental study.
  • It synthesizes and discusses existing research and emerging views in the field.
  • Focuses on reviewing literature regarding presynaptic mechanisms in hair cell synapses.

Main Results:

  • Hair cell synapses employ an unconventional presynaptic molecular composition, including the synaptic ribbon and otoferlin.
  • There is ongoing debate regarding the mechanisms of excitatory postsynaptic current heterogeneity (multiquantal vs. uniquantal release).
  • Understanding the precise coupling of presynaptic Ca(2+) channels and vesicular Ca(2+) sensors remains a key question.

Conclusions:

  • The unique presynaptic machinery of hair cell synapses is essential for high-fidelity auditory signaling.
  • Further research is needed to resolve controversies surrounding vesicle release dynamics and calcium channel-vesicle sensor coupling.
  • Advances in understanding these presynaptic mechanisms are critical for addressing auditory synaptopathy and hearing loss.