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SEM3 ANATOMY > NERVE TRACTS > Flashcards

NERVE TRACTS Flashcards

1
Q

what rexed laminae are associated with nociceptive fibres?

A

1-3

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2
Q

what rexed laminae are associated with motor neurones?

A

8-9

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3
Q

what rexed lamina is associated with preganglionic autonomic neurones

A

7

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4
Q

what tract transmits sensory information regarding pain and temperature?

A

LATERAL spinothalamic

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5
Q

what tract transmits sensory information regarding crude touch and pressure?

A

VENTRAL spinothalamic

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6
Q

what tract transmits sensory information regarding discriminative touch, proprioception and vibration?

A

Dorsal columns

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7
Q

What is the only anatomical difference between the ventral and lateral spinothalamic tracts?

A

2nd order neurones of VENTRAL tract can travel upwards for a number of spinal segments before they decussate

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8
Q

what sensory tract conveys information regarding discriminative touch, proprioception and vibration from the lower limb?

A

fasiculus gracilis

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9
Q

what sensory tract conveys information regarding discriminative touch, proprioception and vibration from the upper limb?

A

fasiculus cuneatus

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10
Q

what is the name of the nucleus of the thalamus associated with the spinothalamic tracts?

A

VP nucleus

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11
Q

where do 1st order neurones of the dorsal column synapse?

A

Nucleus gracilis and cuneatus

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12
Q

describe the path of 2nd order neurones of the dorsal column. What structure do they pass through?

A

neurones decussate in brainstem

ascend through contralateral MEDIAL lemniscus to VP nucleus of thalamus

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13
Q

what pathway controls fine motor movements of the limbs?

A

LATERAL corticospinal tract

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14
Q

what pathway controls movements of axial and girdle muscles?

A

VENTRAL corticospinal tract

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15
Q

through what limb of the internal capsule do fibres in the corticospinal tract pass?

A

posterior limb

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16
Q

what fibres pass through the genu of the internal capsule?

A

corticobulbar (cranial motor)

17
Q

what is the structure and function of the spinocerebellar tract?

A

ascending tract, carries information from the golgi tendon organs and tactile receptors to the cerebellum

involved in control of posture and co-ordination of movement

18
Q

what is the structure and function of the spinoreticulothalamic tract?

A

Ascending pain pathway. Similar to spinothalamic, however ascends to reticular formation > thalamus > cortex

How dull, aching pain is consciously recognised

19
Q

what is the structure and function of the rubrospinal tract?

A

Descending originating from red nucleus of midbrain.

Controls tone of flexor limb muscles

20
Q

what is the structure and function of the vestibulospinal tract?

A

Originates in vestibular nucleus.

Controls extensor muscle tone, involved with posture

21
Q

what is the structure and function of the tectospinal tract?

A

originates in superior colliculus, terminates in C spine.

Mediates reflex movements in response to visual stimuli

22
Q

what is the structure and function of the reticulospinal tract?

A

descends from reticular formation of pons/medulla

mediates pressor and depressor effects of CV system and control of breathing

23
Q

what are the names of the 6 other spinal tracts?

A 
spinoreticulothalamic
rubrospinal
tectospinal
vestibulospinal
spinocerebellar
reticulospinal
24
Q

describe the pathway of the spinoreticulothalamic tract

A

2nd order neurones terminate in reticular formation of medulla
3rd order neurones run to VP nucleus of thalamus
4th order neurones run to post-central gyrus, limbic system and neocortex

25
Q

which sensory spinal pathway uses a 4 neurone relay system?

A

spinoreticulothalamic

26
Q

what regions of the brain does the spinoparabrachial pathway extend to?

A

Amygdala

hypothalamus

27
Q

what is the function of the spinoparabrachial pathway?

A

controls emotional responses to pain e.g. fear

SEM3 ANATOMY (8 decks)

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