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Hair Cells

Hair Cells

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.

Auditory Pathway

Auditory Pathway

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 the...

The Cochlea

The Cochlea

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.

Hearing

Hearing

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.

The Role of Ion Channels in Neuronal Computation

The Role of Ion Channels in Neuronal Computation

A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.

Neuronal Communication

Neuronal Communication

Neurons, the fundamental units of the brain and nervous system, communicate through complex electrochemical signals that underpin all cognitive and bodily functions. This communication is primarily facilitated by a process involving the generation and propagation of an action potential along the axon of the neuron. When the internal electrical charge of a neuron surpasses a certain threshold, an action potential is triggered. This rapid change in voltage travels swiftly along the axon to the...

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Neurite-specific Ca2+ dynamics underlying sound processing in an auditory interneurone.

T Baden¹, B Hedwig

¹Department of Zoology, University of Cambridge, Cambridge, United Kingdom. tb283@cam.ac.uk

Developmental Neurobiology

|April 20, 2007

Summary

Calcium dynamics in cricket neurons (ON1) reveal how intracellular calcium signals modulate auditory processing and directional hearing. This study highlights calcium

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Area of Science:

Neuroscience
Cellular Biology
Auditory Neuroscience

Background:

Neuronal signal processing is understood through available recording techniques and model systems.
The cricket omega-1-neurone (ON1) is a model for auditory pattern and directional processing.

Purpose of the Study:

To investigate intracellular calcium dynamics in the ON1 neuron during auditory stimulation.
To understand how calcium signals influence neuronal electrical activity and auditory processing.

Main Methods:

Simultaneous imaging of intracellular calcium (Ca2+) and recording of membrane potential in vivo.
Acoustic stimulation using single sound pulses and species-specific calling songs.
Analysis of Ca2+ levels in different neuronal compartments (dendrites, axon, cell body).

Main Results:

Ca2+ rise rate correlated with spike rate; final Ca2+ level depended on mean spike rate.
Ca2+ rapidly increased in dendritic and axonal arborizations, particularly at the spike-generating zone.
Species-specific calling song induced Ca2+ oscillations at the chirp rhythm, acting as a noise filter.
Dendrites showed tonotopic responses, filtering high-frequency auditory inputs.

Conclusions:

Intracellular calcium dynamics play a crucial role in auditory pattern recognition and directional processing in the cricket ON1 neuron.
Calcium-mediated hyperpolarization acts as a noise filter, suppressing background activity.
Functional interaction between calcium-mediated and synaptic inhibition is vital for directional auditory processing.