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Neurophysiology > Sensory Pathways 1 > Flashcards

Sensory Pathways 1 Flashcards

1
Q

What type of information do A alpha fibres carry?

A

Proprioception

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2
Q

What type of information do A beta fibres carry?

A

Touch, pressure

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3
Q

What type of information do A delta fibres carry?

A

Pain, temperature

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4
Q

What type of information do C fibres carry?

A

Temperature, pain, itch

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5
Q

What do free nerve endings detect?

A

Pain

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6
Q

What do Merkel’s disks detect?

A

Static touch

Pressure

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7
Q

What do Meissner’s corpuscles detect?

A

Touch, pressure

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8
Q

What do Pacini’s corpuscles detect?

A

Vibration

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9
Q

What do Ruffini corpuscles detect?

A

Skin stretch

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10
Q

Which sensory fibres innervate muscle spindles?

A

Group Ia and II

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11
Q

Which sensory fibres innervate golgi tendon organs?

A

Group Ib

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12
Q

What type of information do the spinocerebellar tracts transmit?

A

Proprioceptive information

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13
Q

What type of information does the spinothalamic tract transmit?

A

Pain

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14
Q

Which type of nerve fibres are present in the dorsal columns?

A

Large A beta fibres

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15
Q

Where do neurons project to from the medial lemniscus in the DCML pathway?

A

Ventral Posterolateral Lobe of Thalamus

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16
Q

What is a classic sign of gait ataxia?

A

Stamp and stick - slap foot down to get max sensory input and maintains a broad based stance

17
Q

Which signs on examination indicate dorsal column disease?

A

Inability to feel joint position or vibration by a tuning fork
Positive Romberg’s test

18
Q

What are the cortical functions of the dorsal column pathway?

A

Determine shape and texture of objects

19
Q

What happens if someone has a lesion in the somatosensory association cortex?

A

Unable to regonise complex objects by touch (on opposite side)
Patients may neglect one whole side of body - overlook motor output

20
Q

Which sensory receptor is found only in glabrous skin types?

A

Meissner’s corpuscles

21
Q

Which sensory receptor has a high activation threshold?

A

Free nerve endings

22
Q

What is the purpose of lateral inhibition?

A

Sharpens the discrimination between two points

23
Q

What is lateral inhibition?

A

Lateral inhibition is the capacity of an excited neurone to reduce the activity of its neighbours

24
Q

Why does damage to the gracile fasciculus cause gait ataxia?

A

Brain is deprived of information about the position of the feet

25
Q

Why do people with dorsal column disease experience parasthesias?

A

Ectopic discharge in damaged dorsal column axons

26
Q

What is amorphosynthesis?

A

Inability to recognise complex objects by touch on the opposite side of the lesion

Neurophysiology (17 decks)

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