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MD2S3: Anatomy 203 > Ascending Pathways > Flashcards

Ascending Pathways Flashcards

1
Q

What are the three neuron groups of the anterior grey columns?

A

Medial Group
Central Group
Lateral Group

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2
Q

Anterior Grey Columns
What are the nuclei of the medial group?

A

Ventromedial
Dorsomedial

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3
Q

Anterior Grey Columns
In which spinal cord segments can the medial group nuclei be found?

A

In all segments

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4
Q

Anterior Grey Columns
What are the nuclei of the central group?

A

Phrenic nucleus
Lumbo-sacral nucleus

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5
Q

Anterior Grey Columns
In which spinal cord segments can the central group nuclei be found?

A

Phrenic Nucleus: C3, 4, 5
Lumbo-Sacral Nucleus: L2, 3, 4, 5 and S1

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6
Q

Anterior Grey Columns
What are the nuclei of the lateral group?

A

Ventrolateral
Dorsolateral
Retrodorsolateral

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7
Q

Anterior Grey Columns
At which spinal cord segments can the lateral group nuclei be found?

A

Cervical and lumbo-sacral (segments supplying limbs)

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8
Q

What are the four neuron groups of the posterior grey columns?

A

Substantia gelatinosa of Rolando
Nucleus Proprius
Nucleus Dorsalis of Clarke
Visceral Nucleus

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9
Q

Posterior Grey Columns
Purpose of Substantia Gelantinosa of Rolando

A

Exteroception
Relay station for pain and temperature fibers

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10
Q

Posterior Grey Columns
Where is the Substantia Gelatinosa of Rolando found?

A

Present throughout entire spinal cord length

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11
Q

Posterior Grey Columns
What do the axons of the Substantia Gelatinosa of Rolando give rise to?

A

Axons give rise to lateral spinothalamic tract

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12
Q

Posterior Grey Columns
Purpose of Nucleus Proprius

A

Exteroception
Associated with mechanical (touch + pressure) sensations

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13
Q

Posterior Grey Columns
Location of Nucleus Proprius

A

Present throughout entire spinal cord length

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14
Q

Posterior Grey Columns
Purpose of Nucleus Dorsalis of Clarke

A

Proprioception

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15
Q

Posterior Grey Columns
Location of Nucleus Dorsalis of Clarke

A

Present in C8-L3 segments

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16
Q

Posterior Grey Columns
What fibers does the Nucleus Dorsalis of Clarke receive?

A

Receives afferent fibers from muscle and tendon spindles transferring signals to the cerebellum

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17
Q

Posterior Grey Columns
Features of Visceral Nucleus

A

Receives visceral afferent fibers

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18
Q

What are the two neuron groups of the lateral grey columns?

A

Interomediomedial
Interomediolateral

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19
Q

Lateral Grey Columns
Nuclei Locations

A

Locations:
T1 - L2 - Preganglionic sympathetic fibers
S2,3,4 - Preganglionic parasympathetic fibers

20
Q

Lamina of the spinal cord

A

Basing Spinal Cord regions according to structure and function

21
Q

Purpose of Lamina 1-4

A

Exteroception

22
Q

Purpose of Lamina 5-6

A

Proprioception

23
Q

Purpose of Lamina 7

A

Visceral sensation

24
Q

Purpose of Lamina 8-9

25
Q

Purpose of Lamina 10

A

Contains decussating axons

26
Q

What are ascending tracts?

A

Convey sensory stimuli through the spinal cord

27
Q

What types of stimuli can the ascending tract convey?

A

Exteroceptive
Proprioceptive (conscious and non-conscious)

Concious proprioception includes vibration, pressure, sense of position and sense of movement

28
Q

Which tracts convey exteroceptive stimuli?

A

Lateral Spinothalamic
Anterior Spinothalamic

29
Q

Which tracts convey proprioceptive non-concious stimuli?

A

Ventral Spinocerebellar Tracts
Dorsal Spinocerebellar Tracts

30
Q

Which tracts convey both exteroceptive and conscious proprioceptive stimuli?

A

Fasciculus Cuneatus
Fasciculus Gracilis

31
Q

Function of the Lateral Spinothalamic Tract

A

Conveys pain and temperature from opposite side of the body

32
Q

How can lesions of the Lateral Spinothalamic Tract affect sensation?

A

Produces contralateral loss of pain and temperature sensation below the lesion

33
Q

Function of the Anterior Spinothalamic Tract

A

Conveys crude touch and pressure from opposite side of the body

34
Q

How can lesions of the Anterior Spinothalamic Tract affect sensation?

A

Produces contralateral loss of touch and pressure below the lesion

35
Q

What is the spinal lemniscus?

A

Another name for anterior and lateral spinothalamic tracts

36
Q

Fill out

37
Q

Function of the Fasciculus Cuneatus

A

Conveys fine touch and concious proprioceptive stimuli from opposite side of body
Derived from cervical and upper thoracic segments

38
Q

Function of the Fasciculus Gracilis

A

Same function as fasciculus cuneatus except fibers are derived from lower thoracic, lumbar, sacral and coccygeal segments

39
Q

How can lesions of the Fasciculus Cuneatus/Gracilis affect sensation?

A

Cause ipsilateral loss of conscious proprioceptive sensations below lesion level (because crossing occurs at level of medulla)

40
Q

What is the medial lemniscus?

A

Formed from crossing of internal arcuate fibers

41
Q

What are internal arcuate fibers?

A

Composed of axons of nucleus cuneatus and gracilis

42
Q

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43
Q

Function of Ventral Spinocerebellar Tract

A

Unconcious proprioception - Carries muscle and joint information from the muscle spindles, tendons and organs of the upper and lower limbs and trunk

44
Q

Function of the Dorsal Spinocerebellar Tract

A

Unconcious proprioception - Carries muscle, joint information from the muscle spindles, tendon and organs of the trunk and lower limbs

45
Q

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MD2S3: Anatomy 203 (31 decks)

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