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Histo & Neuro Part 2 > Ascending and Descending Spinal Tracts > Flashcards

Ascending and Descending Spinal Tracts Flashcards

1
Q

Site of origin of lateral corticospinal tract

A

Primary motor cortex 4, 6 - pyramidal cells

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2
Q

Site of decussation of lateral corticospinal tract

A

Pyramidal decussation at cervicomedullary junction

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3
Q

Where does the lateral corticospinal tract terminate

A

Ventral horn motor neurons / entire cord - mostly enlargments of c & l

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4
Q

Function of lateral corticospinal tract

A

Movement of contralateral limbs, particularly digits

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5
Q

Site of origin of rubrospinal tract

A

Red nucleus of midbrain tegmentum

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6
Q

Site of decussation of rubrospinal tract

A

Ventral tegmental decussation in midbrain (tectum)

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7
Q

Where does the rubrospinal tract terminate

A

Ventral horn of Cervical cord

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8
Q

Function of rubrospinal tract

A

Movement of contralateral limbs - flexors

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9
Q

Site of origin of anterior corticospinal tract

A

Primary motor cortex

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10
Q

Site of decussation of anterior corticospinal tract

A

Does not decussate

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11
Q

Where does the anterior cortispinal tract terminate

A

Ventral horn motor neurons / Cervical and thoracic cord

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12
Q

Function of anterior corticospinal tract

A

Control of axial muscles

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13
Q

Site of origin of medial vestibulospinal tract

A

Medial and inferior vestibular nuclei

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14
Q

Site of decussation of medial vestibulospinal tract

A

Does not decussate

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15
Q

Where does the vestibulospinal tract terminate

A

Interneurons at Cervical and thoracic cord

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16
Q

Function of the medial vestibulospinal tract

A

Positioning of head and neck posture

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17
Q

Site of origin of lateral VST

A

Lateral vestibular nuclei

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18
Q

Site of decussation of lateral VST

A

Does not decussate

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19
Q

Where does the lateral VST terminate

A

Interneurons at ventral horn Entire cord

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20
Q

Function of the lateral VST

A

Balance and posture of extensor muscles

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21
Q

Site of origin of reticulospinal tract

A

Medial -Pontine nucleus and
Lateral or medullary - gigantocellular nucleus in medullary reticular formation

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22
Q

Site of decussation of reticulospinal tract

A

Does not decussate, have their own medial and lateral reticulospinal tracts

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23
Q

Where does the reticulospinal tract terminate

A

Interneurons and motor neurons of Entire cord

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24
Q

Function of reticulospinal tract

A

Posture and voluntary movement reflex activity
Pontine - extensor
Medullary - flexor

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25
Q

Site of origin of tectospinal tract

A

Superior colliculus of midbrain

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26
Q

Site of decussation of tectospinal tract

A

Dorsal tegmental decussation in midbrain soon after origin (tectum)

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27
Q

Where does the tectospinal tract terminate

A

Interneurons of Upper Cervical cord ^^

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28
Q

Function of the tectospinal tract

A

Coordination of head and eye movements

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29
Q

Weakness of one side of body

A

Paresis

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30
Q

No movement of one side of body

A

Plegia

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31
Q

No movement of legs

A

Paralysis

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32
Q

Weakness or paralysis of face muscles

33
Q

Where does the corticospinal tract travel through until decussation

A

corona radiata - internal capsule - basis pedunculi - transverse pontocerebellar fibers - pyramid

34
Q

Corticospinal deficits

A

Clasp-knife spasticity
Babinski’s sign
Hemiparesis weakness
Hyperreflexia

35
Q

Corticospinal lesions above decussation

A

Contralateral deficits

36
Q

Corticospinal lesions below decussation

A

Ipsilateral deficits

37
Q

Midbrain lesion at corticospinal tract deficits

A
  1. contralateral hemiparesis weakness
  2. deviation of ipsilateral eye down and lateral
38
Q

Why does the midbrain affect eye down and lateral

A

branches of posterior cerebral artery supplying oculomotor nerve to elevate and adduct eye

39
Q

Pons lesion at corticospinal tract deficits

A
  1. contralateral hemiparesis
  2. deviation of the eye inward
40
Q

Why does the pons affect eye inward

A

branches of basilar artery affect abducens nerve the innervated lateral rectus muscles which abducts eye

41
Q

Medulla lesion at cortispinal tract deficits

A
  1. contralateral hemiparesis
  2. ipsilateral flaccid paralysis of tongue deviation towards lesion
42
Q

Why does the medulla affect tongue

A

branches of anterior spinal artery affect hypoglossal nucleus innervating muscle of tongue movement

43
Q

Where does the rubrospinal tract descends through

A

lateral funniculus

44
Q

Where does the medial VST descend through

A

medial longitudinal fasciculus MLF

45
Q

Where does the lateral VST descend through

A

ventral funiculus

46
Q

Function of Dorsal column medial lemniscus pathway

A

Discrimiative touch, vibration, proprioception

47
Q

1st order neuron of DCML

A

DRG (Ia, Ib, II) fasciculi gracilis and cuneatus

48
Q

2nd order neuron of DCML

A

nuclei gracilis and cuneatus at medulla

49
Q

3rd order neuron of DCML

A

ventral posterolateral nucleus of thalamus (VPL)

50
Q

How do you test for conscious proprioception

A

field sobriety test

51
Q

Where does the DCML decussate

A

2nd order neurons decussate at IAF internal arcuate fibers

52
Q

Deficits due to lesions in the DCML

A

loss of sense of touch, vibration and proprioception

53
Q

Lesions above IAF decussation

A

Deficits are below on opposite side

54
Q

Lesions below IAF

A

Deficits are below and on same side of lesion

55
Q

1st order neurons of Anterolateral pathway

A

DRG via tract of Lissauer and synapse with Proper sensory Nucleus

56
Q

2nd order neurons of anterolateral pathway

A

dorsal horn cross to ventral white commisure

57
Q

where does the anterolateral pathway decussate

A

anterior white commisure to ventrolateral column

58
Q

where does the anterolateral pathway ascend through

A

contralateral VPL to thalamus

59
Q

3rd order neurons of anterolateral pathway

A

VPL goes through posterior limb of internal capsule to corona radiata

60
Q

Deficits to anterolateral pathway

A

Loss of pain and temperature sensation on contralateral side of the body

beginning one to two levels below the lesion

61
Q

white commisure is damaged

A

syringomelia

62
Q

1st order neurons of dorsal spinocerebellar

63
Q

2nd order neurons of dorsal spinocerebellar

A

nucleus dorsalis of Clarke’s T1-L3

64
Q

where does the dorsal spincerebellar tract enter

A

inferior cerebellar peduncle

65
Q

function of dorsal cerebellar

A

trunk and lower limbs proprioception

66
Q

1st order neurons of ventral spinocerebellar

67
Q

2nd order neurons of ventral spinocerebellar

A

nucleus dorsalis

68
Q

where does decussation take place in ventral spinocerebellar

A
  1. at 2nd order neuron dorsal to ventral spinocerebellar tract
  2. cross back behind cerebellum
69
Q

function of ventral cerebellar

A

lower limb proprioception

70
Q

1st order neurons of cuneocerebellar

71
Q

2nd order neurons from cuneocerebellar

A

accesory cuneate nucleus

72
Q

where do cuneocerebellar axons travel through

A

fasciculus cuneatus

73
Q

where do 2nd order neurons cuneocerebellar tract enter cerebellum

A

inferior cerebellar peduncle

74
Q

function of cuneocerebellar

A

upper limb and trunk proprioception

75
Q

deficits of lesions to cerebellar pathways

A

dystaxia or ataxia - coordination difficulty

76
Q

dorsal spinocerebellar damage

A

ipsilateral leg dystaxia

77
Q

ventral spinocerebellar damage

A

contralateral leg dystaxia

78
Q

cuneocerebella damage

A

ipsilateral arm dystaxia

Histo & Neuro Part 2 (13 decks)

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