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Neurology > Ascending And Descending Tracts > Flashcards

Ascending And Descending Tracts Flashcards

1
Q

Where do tracts of the conscious pathway go

A

Pass through thalamus and get to Cerebral cortex

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2
Q

What are the ascending tracts

A 
Lateral spinothalamic tract 
Ventral spinothalamic tract 
Posterior column 
Dorsal spinocerebellar 
Ventral spinocerebellar 
Spinoolivary
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3
Q

Function of dorsal column

A

Conscious propioception like discriminatory touch ,vibration ,form recognition ,joints and muscles sensation

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4
Q

Inputs of posterior column

A

Input : pacini and meissner corpuscle , joint receptos, mucle spindles, golgi tendon organ

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5
Q

Where is the first order neuron of the posterior column located

A

In the dorsal root ganglion at all levels

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6
Q

\ Where do ascending fibers of posterior column travel

A

Fasciculus in gracilis and fasciculus cuneatus

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7
Q

Where do you find fasciculus a gracilis in the spinal cord

A

In the lumbar and sacral region

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8
Q

Where do you find fasciculus cuneatus in the spinal cord

A

In upper thoracic and cervical

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9
Q

Where are located the second order you one of the posterior column

A

In the gracile and cuneate nuclei of caudal medulla

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10
Q

What fiber is formed by gracile and cuneate nuclei

A

Internal Arcuate fibers

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11
Q

At which level does the posterior column decussate

A

In the medulla when internal arcuate fiber is formed

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12
Q

What structure is formed after decussation of the internal arcuate fiber

A

Medial lemniscus

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13
Q

Where does the medial leminscus ascends in the brainstem and where does it terminate

A

Contralateral brainstem and terminate in ventral posterolateral nucleus of thalamus

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14
Q

Where are the third order neurons of the dorsal column located

A

In the ventroposterolateral nucleus of thalamus

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15
Q

Where do the third order neurons of the posterior column project to

A

To the postcentral gyrus

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16
Q

Function of posterior spinocerebellar tract

A

Unconscious propioception of muscle joint sense and pressure

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17
Q

Where is the second order neuron of posterior spinocerebellar tract located

A

Nucleus dorsalis of clarke from t1 to l3

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18
Q

Does the posterior spinocerebellar tract cross

A

no

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19
Q

From where does the posterior spinocerebellar tract enter the cerebellum

A

Through inferior peduncl

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20
Q

Function of ventral spinocerebellar tracts

A

Unconscious propioception to cerebellum from trunk upper and lower limbs

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21
Q

Where do the first order nucleus of the ventral spinocerebellar tract end

A

Nucleus dorsalis

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22
Q

Are second order neurons of the ventral spinocerebellar tract crossed

A

Yes

23
Q

From where do the central spinocerebellar tract neuron enter the cerebellum

A

Superior cerebellar peduncl

24
Q

Function of lateral spinothalamic tract

A

Mediate pain and temperature

25
Q

Where are the first order neuron of the lateral spinothalamic tract located

A

In the dorsal root ganglion

26
Q

Tract formed when ascending branhch of lateral spinothalamic forned

A

Posterolateral tract of lissauer

27
Q

Is the Lateral spinothalamic tract crossed and conscious

A

Yes

28
Q

Where do the second order neurons of the lateral spinothalamic tract end

A

Contralateral thalamus

29
Q

What is the function of the anterior spinothalamic tract

A

Light touch

pressure

30
Q

Where are the first order neuron of the anterior spinothalamic tract located

A

Dorsal root ganglion

31
Q

Where are the second order neuron of the anterior spinal ceramic tract located

A

Posterior grey horn in substantia gelatinosa where they cross

32
Q

Where do the second or the neuron of the anterior spinothalamic tract end

A

The ventral posterolateral tract of thalamus via posteiror limb of internal capsule and corona radiata

33
Q

What are lower motor neuron

A

Neurons of the interior gray horn of the spinal cord that innervate skeletal muscle

34
Q

What are the upper motor neuron

A

Urine from Supraspinal areas that are descending tracts

35
Q

What are the major descending pathways

A 
Lateral corticospinal tract 
ventral corticospinal tract 
rubrospinal tract 
tectospinal tract
Vestibulospinal tract 
reticulospinal tract
Autonomic
36
Q

Function of corticospinal tract

A

Voluntary discrete skilled movement

37
Q

Function of Reticulospinal tract

A

Facilitate or inhibits voluntary movement or reflex activity

38
Q

Tectospinal tract function

A

Reflex postural movements in response to visual stimuli

39
Q

Rubrospinal tract function

A

Facilitate activity of flexor muscles and inhibits extensor muscle

40
Q

Vestibular spinal tract function

A

Inhibit flexor muscle

Facilitate extensor muscle

41
Q

Autonomy function

A

Visceral activity

42
Q

What are the tract part of the Piramidal system

A

Corticospinal tract

43
Q

Where do the fibers of the corticospinal tract originate from in the cortex

A

2/3 originate from precentral gyrus 1/3 originate from postcentral gyrus

44
Q

Number of axons per pyramids cells

A

About 1 million

45
Q

Percentage of myelinated axons in corticospinl meduulla

A

70

46
Q

75 to 90% of fibers of corticospinal tract decussate at spinomedullary junction and form

A

Lateral corticospinal tract

47
Q

Origin of rubrospinal tract

A

Red nucleus in midbrain

48
Q

Does the rubrospinal tract cross

A

Yes

49
Q

Origin of tectospinal tract

A

Superior colliculus of midbrain

50
Q

Where does the tectospinal tract cross

A

In the periaquaductal grey

51
Q

What happens if there’s acute lesions to the upper motor neuron

A

Transient spinal shock with flaccid paralysis, areflexa ,hypotonia

52
Q

What happens if there’s chronic lesions to the upper motor neuron

A 
Spastic paralysis 
hypertonia 
reduction or loss of superficial abdominal and cremasteric reflex 
extensor toe response (babinski sign)
Clonus
53
Q

Consequences of lesion to lower motor neuron

A 
Flaccid paralysis 
areflexia
Muscle atrophy
Fasciculation
Fibrilliatio

Neurology (31 decks)

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