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Related Concept Videos

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.
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Cholinergic Neurons: Neurotransmission01:23

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Cholinergic neurotransmission involves the synthesis and the release of acetylcholine (ACh) in order to transmit nerve impulses across the synapse. The process begins with the synthesis of acetyl CoA, a precursor for ACh, from ATP, acetate, and coenzyme A in the mitochondria. Choline, another vital precursor, is transported inside the neuron through choline transporters, including high-affinity choline transporter CHT1, low-affinity choline transporter CTL1, and lower-affinity choline...
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Parasympathetic signaling plays a crucial role in regulating various physiological processes. It involves the release of acetylcholine (ACh) by parasympathetic neurons, which can have localized and short-lived effects. The majority of ACh released is rapidly inactivated at the synapse by the enzyme acetylcholinesterase (AChE), which hydrolyzes Ach into choline and acetate. Additionally, the tissue cholinesterase deactivates any ACh diffusing into the surrounding tissues.
The effects of...
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The Cochlea01:13

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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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Cholinergic Receptors: Muscarinic01:25

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The pharmacological actions of acetylcholine are elicited via its binding to two families of cholinergic receptors or cholinoceptors, namely, muscarinic and nicotinic receptors. Muscarinic receptors are G protein-coupled receptors and have five subtypes, M1–M5. All mAChR subtypes are activated by acetylcholine and blocked by the antagonist, atropine. 
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Indirect-Acting Cholinergic Agonists: Pharmacological Actions01:30

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Indirect-acting cholinergic agonists, also known as anticholinesterases, exert their pharmacological effects by enhancing cholinergic transmission in various body parts, including the neuromuscular junction, autonomic cholinergic synapses, and the brain.
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Related Experiment Video

Updated: Jun 22, 2025

Optogenetic Stimulation of the Auditory Nerve
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Cholinergic modulation in the vertebrate auditory pathway.

Chao Zhang1, R Michael Burger2

  • 1Cold Spring Harbor Laboratory, Cold Spring Harbor, NY, United States.

Frontiers in Cellular Neuroscience
|July 4, 2024
PubMed
Summary
This summary is machine-generated.

Acetylcholine (ACh) is a key neuromodulator in the brain. This review details its role in auditory processing, focusing on brainstem and midbrain auditory centers.

Keywords:
acetylcholineauditorymodulationmuscarinicnicotinicsound

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Neurophysiology

Background:

  • Acetylcholine (ACh) is a widespread neurotransmitter and neuromodulator in the nervous system.
  • ACh influences neurophysiological phenomena like transmitter release and membrane excitability.
  • In sensory systems, ACh adapts neural responses to stimuli and coordinates neuronal activity.

Purpose of the Study:

  • To review the known roles of cholinergic function in the auditory system, from the ear to the cortex.
  • To emphasize the function of ACh in brainstem and midbrain auditory centers.
  • To explore receptor expression, modulation mechanisms, and functional implications of ACh in sound processing.

Main Methods:

  • Review of existing literature on cholinergic function in the auditory pathway.
  • Focus on histological evidence of acetylcholine receptor (AChR) expression.
  • Analysis of studies investigating ACh modulation in auditory processing.

Main Results:

  • AChRs are expressed throughout the ascending auditory pathway.
  • Cholinergic modulation impacts neural responses to auditory stimuli.
  • ACh plays a crucial role in adapting to complex sensory stimuli.

Conclusions:

  • ACh is essential for sensory processing, including auditory function.
  • Further research is needed on cholinergic networks in auditory brainstem and midbrain centers.
  • ACh significantly impacts sound processing throughout the auditory pathway.