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Neurobiology > Sensory coding and perception > Flashcards

Sensory coding and perception Flashcards

1
Q

All receptors in the skin are low threshold except for which type of receptor?

A

Nociceptors

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2
Q

What fibres send impulses from hair follicle receptors?

A

A beta fibres

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3
Q

What fibres transmit sharp pain?

A

A delta

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4
Q

What fibres transmit dull aches?

A

C

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5
Q

What do Meissner corpuscles respond to?

A

Touch receptors - detect tapping or fluttering

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6
Q

What fibres send impulses from Meissner corpuscles

A

A beta

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7
Q

What do Merkel cells respond to?

A

Touch type stimulation

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8
Q

What fibres send impulses from Pacinian corpuscles?

A

A beta

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9
Q

What do Pacinian corpuscles respond to?

A

Vibration information (mechanical pressure)

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10
Q

What fibres send impulses from Ruffini corpuscles?

A

A beta

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11
Q

What to Ruffini corpuscles respond to?

A

Stretch

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12
Q

Where is the cell body of sensory neurones?

A

Dorsal root ganglion

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13
Q

How are signals transduced at Pacinian corpuscle?

A

Pressure changes alter the shape fo the corpuscle, altering shape of pressure sensitive Na+ channels, Na+ moves in and depolarises the membrane, voltage gated Na+ channels open

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14
Q

What is a generator potential?

A

Depolarisation due only to pressure sensitive Na+ channels

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15
Q

What is tonic firing Arte?

A

A constant rate

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16
Q

What are rapidly adapting receptors

A

Stop firing when a constant stimulation occurs

17
Q

Which type of corpuscles are rapidly adapting?

A

Meissner and Pacinian

18
Q

What are slow adapting receptors?

A

Fire faster as the stimulus increases

19
Q

Which type of receptors are slow adapting receptors?

A

Ruffini and Merkel

20
Q

What is a receptive field?

A

An area in which the nerve endings can send out signals and pick up information

21
Q

What is lateral inhibition?

A

Ability of activated neurones to inhibit neighbours allowing more accurate localisation of pain

22
Q

Describe convergence in the retina and describe why this is helpful

A

Axons of rods will converge so less need to be stimulated to see in black and white

23
Q

What is the function of divergence of neurones?

A

Amplify a signal

24
Q

Why do receptive fields that have been stimulated in the centre inhibit the lateral ones?

A

The ones hit in the centre fire more frequently so are stronger - will inhibit via interneurones

Neurobiology (21 decks)

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