Neuroprothetics at TU München | Flashcards & Summaries

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Lernmaterialien für Neuroprothetics an der TU München

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What is the pinna important for ?

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sound localization

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How do we differentiate where the sound is coming from when it is in the vertical plane: from up or form behind ?

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There is no difference in the delay or amplitude → the difference if the signal is coming from the back or front is that the frequency specific notches and they depend of the form of the pina which shifts when the signal at different elevations > get an estimate of the spectrum of the sound system and try to find out a notch in the signal and at which frequency that notch is

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what are efferent fibres ?

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fibres transmitting information back in the direction of the periphery

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How is the full range if listening range intensity physiologically possible ?

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in a population of fibers with different threshholds

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Where do different frequencies peak in the travelling wave ?

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high frequencies peak at the base where the membrane is stiffand tune to high frequencies

For low frequences the travelling wave peaks closer to the apex of the inner ear

The wave runs from baseto apex and gets slower and slower → points move up and down at a certain speed and the nearer to apex, the lower the speed

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When do we get autoacoustic emissions ?

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When the amplification gets unstable

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How do the parts of phospholypids react to water ?

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- tail: hydrophobic

- head: hydrophilic

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what are afferent fibres ?

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ascending pathways transmitting the collected information for sensory receptors in the direction of the brain

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Structure of the Sodium channel

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three activation gates m and one inactivation gate h

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When is it not possible to stimulate the axon ?

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when constant E field → activation is zero

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Describe the anatomy of the cochlea

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Fluid filled cavities: scala tympani, scala vestibuli, scala media → they spiral their way up from the base of the cochlea to the apex

The three cavities spearated by a membrane: Reissner Membrane and the organ of corti, the sensory organ which sits in the basilar membrane.

In the middle the cochlear nerve running to the brain. The spiral ganglion, where the cell bodes of the auditory nerve sits.

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What chemical element is symboled: K?

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Potassium

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Q:

What is the pinna important for ?

A:

sound localization

Q:

How do we differentiate where the sound is coming from when it is in the vertical plane: from up or form behind ?

A:

There is no difference in the delay or amplitude → the difference if the signal is coming from the back or front is that the frequency specific notches and they depend of the form of the pina which shifts when the signal at different elevations > get an estimate of the spectrum of the sound system and try to find out a notch in the signal and at which frequency that notch is

Q:

what are efferent fibres ?

A:

fibres transmitting information back in the direction of the periphery

Q:

How is the full range if listening range intensity physiologically possible ?

A:

in a population of fibers with different threshholds

Q:

Where do different frequencies peak in the travelling wave ?

A:

high frequencies peak at the base where the membrane is stiffand tune to high frequencies

For low frequences the travelling wave peaks closer to the apex of the inner ear

The wave runs from baseto apex and gets slower and slower → points move up and down at a certain speed and the nearer to apex, the lower the speed

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Q:

When do we get autoacoustic emissions ?

A:

When the amplification gets unstable

Q:

How do the parts of phospholypids react to water ?

A:

- tail: hydrophobic

- head: hydrophilic

Q:

what are afferent fibres ?

A:

ascending pathways transmitting the collected information for sensory receptors in the direction of the brain

Q:

Structure of the Sodium channel

A:

three activation gates m and one inactivation gate h

Q:

When is it not possible to stimulate the axon ?

A:

when constant E field → activation is zero

Q:

Describe the anatomy of the cochlea

A:

Fluid filled cavities: scala tympani, scala vestibuli, scala media → they spiral their way up from the base of the cochlea to the apex

The three cavities spearated by a membrane: Reissner Membrane and the organ of corti, the sensory organ which sits in the basilar membrane.

In the middle the cochlear nerve running to the brain. The spiral ganglion, where the cell bodes of the auditory nerve sits.

Q:

What chemical element is symboled: K?

A:

Potassium

Neuroprothetics

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