Ascending neural pathways Flashcards

1
Q

what does fasciculus grascilis carry

A

information from lower body extremities

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2
Q

what does fasciculus cuneatus carry

A

upper body extremeties

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3
Q

what do the dorsal and ventral spinocerebellar tracts carry

A

proprioceptive information from muscle spindles and golgi organs

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4
Q

what do the spinal thalamic tracts carry

A

pain (anterolateral system)

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5
Q

what does a large area in the sensory homunculus represent

A

areas fed by nerves with small receptive fields

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6
Q

what are the three principle ascending tracts in the spinal cord

A

dorsal column medial lemniscus pathway

spinothalamic pathway

spinocerrebellar

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7
Q

what could cause a gait ataxia

A

dorsal column medial lemniscus pathway pathology

proprioception, touch pressure and vibration deprived

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8
Q

what is sensory ataxia

A

loss of coordination caused by a loss of sensory input

patient may be able to compensate using vision

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9
Q

a patient presents with paraesthesia in the fingers and toes. what is a possible cause

A

dorsal column disease

due to ectopic discharge in dorsal column axons

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10
Q

what are you looking for when testing the ability to feel a tuning fork vibration or position of fingers and toes

A

dorsal column function

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11
Q

what column carries fine touch

A

dorsal column

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12
Q

what pathway carries crude or non discriminating touch

A

spino thalamic

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13
Q

which pathway contains fibres that are quick to cross

A

spino thalamic

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14
Q

what fibres carry dull pain and itch

A

C

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15
Q

what pathway contains neurons that synapse in the dorsal horn

A

spinothalamic

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16
Q

what fibres are found in the lateral spinothalamic route

A

mix of Ad and C fibres

17
Q

what fibres are carried in the ventral spinothalamic anterior route

A

only C fibres

18
Q

what can lateral spinothalamic tract lesions cause

A

decreased perception of pain and temp on the contralateral side

also shooting/electrical type pain

19
Q

what is the purpose of the spinocerrebellar pathways

A

carry information from muscle spindles and golgi organs and touch receptors to the cerrebelum for control of posture and coordination of movement

20
Q

how many neurons are found in the spinocerrebellar tract

A

just first and second order

located in the dorsal horn of the spinal cord and teminate in the vermis of the cerrebelum

21
Q

which spinocerrebellar neurons ascend ipsilaterally and enter the cerebellum via the inferior peduncle

A

dorsal tract neurons

22
Q

what is Friedreichs ataxia

A

spinocerrebellar tract becomes increasingly ineffective

frataxin repeat gene

reeling gait
intention tremour
uncoordinated arm and leg movement