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Lauren > Neuro L.9 Main Concepts > Flashcards

Neuro L.9 Main Concepts Flashcards

1
Q

What is the function of the DCML pathway?

A

Light touch, proprioception, vibration, 2 point discrimination

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2
Q

What are the first order neurons in the DCML pathway?

A

Peripheral receptors → gracile/cuneate in medulla

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3
Q

What are the second order neurons in the DCML pathway?

A

Gracile/cuneate in medulla → thalamus

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4
Q

What are the third order neurons in the DCML pathway?

A

Thalamus → primary somatosensory cortex

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5
Q

Where does decussation occur in the DCML pathway?

A

Posterior to pyramidal decussation in medulla

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6
Q

What is the function of the anterolateral spinothalamic tract?

A

Anterior: crude touch; Lateral: pain, temperature

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7
Q

What are the first order neurons in the anterolateral spinothalamic tract?

A

Dorsal root ganglion → dorsal horn (substantia gelatinosa)

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8
Q

What are the second order neurons in the anterolateral spinothalamic tract?

A

Dorsal horn → thalamus

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9
Q

What are the third order neurons in the anterolateral spinothalamic tract?

A

Thalamus → primary and secondary somatosensory cortex

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10
Q

Where does decussation occur in the anterolateral spinothalamic tract?

A

At level of SC entry (anterior commissure)

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11
Q

What is the function of the slow medial pathway?

A

Slow, dull pain

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12
Q

What are the first order neurons in the slow medial pathway?

A

C fibers → dorsal horn

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13
Q

What are the second order neurons in the slow medial pathway?

A

Dorsal horn → spinolimbic, spinomesencephalic, spinoreticular

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14
Q

Where does decussation occur in the slow medial pathway?

A

At level of SC entry

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15
Q

What is the function of the dorsal spinocerebellar tract?

A

Unconscious proprioception from LE

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16
Q

What are the first order neurons in the dorsal spinocerebellar tract?

A

Type 1a fibers (muscle spindles) in LE → Clark’s nucleus (dorsal horn)

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17
Q

What are the second order neurons in the dorsal spinocerebellar tract?

A

Clark’s nucleus (dorsal horn) → inferior cerebellar peduncle

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18
Q

Where does decussation occur in the dorsal spinocerebellar tract?

A

Uncrossed

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19
Q

What is the function of the cuneocerebellar tract?

A

Unconscious proprioception from UE and face

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20
Q

What are the first order neurons in the cuneocerebellar tract?

A

Type 1a fibers (muscle spindles) in UE → lateral cuneate medulla

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21
Q

What are the second order neurons in the cuneocerebellar tract?

A

Lateral cuneate medulla → inferior cerebellar peduncle

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22
Q

Where does decussation occur in the cuneocerebellar tract?

A

Uncrossed

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23
Q

What is the function of the ventral spinocerebellar tract?

A

Unconscious proprioception from LE

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24
Q

What are the first order neurons in the ventral spinocerebellar tract?

A

LE interneurons (type Ib fibers - GTOs) → dorsal root ganglion

25
What are the second order neurons in the ventral spinocerebellar tract?
Dorsal root ganglion → superior cerebellar peduncle
26
Where does decussation occur in the ventral spinocerebellar tract?
DOUBLE CROSS: 1. At SC level (anterior commissure); 2. Superior cerebellar peduncle
27
What is the function of the rostral spinocerebellar tract?
Unconscious proprioception from UE
28
What are the first order neurons in the rostral spinocerebellar tract?
UE interneurons (type Ib fibers - GTOs) → dorsal horn
29
What are the second order neurons in the rostral spinocerebellar tract?
Dorsal horn → superior and inferior cerebellar peduncles
30
Where does decussation occur in the rostral spinocerebellar tract?
Uncrossed
31
What is the function of the medial corticospinal tract?
Postural, proximal, axial movements
32
What are the first order neurons in the medial corticospinal tract?
Premotor cortex → medial funiculus of SC
33
What are the second order neurons in the medial corticospinal tract?
Medial funiculus of SC → NMJ of muscles
34
Where does decussation occur in the medial corticospinal tract?
Uncrossed
35
What is the function of the lateral corticospinal tract?
Distal limb movements
36
What are the first order neurons in the lateral corticospinal tract?
Primary motor cortex → lateral funiculus of SC
37
What are the second order neurons in the lateral corticospinal tract?
Lateral funiculus of SC → NMJ of muscles
38
Where does decussation occur in the lateral corticospinal tract?
Pyramidal decussation in medulla
39
What is the function of the corticobulbar tract?
Voluntary movement of facial muscles
40
What are the first order neurons in the corticobulbar tract?
Primary motor cortex → motor nuclei of CN
41
What are the second order neurons in the corticobulbar tract?
Motor nuclei of CN → muscles
42
Where does decussation occur in the corticobulbar tract?
Crosses at brainstem at different levels for each CN
43
What is the function of the reticulospinal tract?
Postural control of trunk and proximal muscles
44
What are the first order neurons in the reticulospinal tract?
Reticular formation → spinal motor neurons
45
What are the second order neurons in the reticulospinal tract?
Spinal motor neurons → trunk, proximal muscles
46
Where does decussation occur in the reticulospinal tract?
Uncrossed
47
What is the function of the medial vestibulospinal tract?
Balance and posture of neck, back, and postural muscles
48
What are the first order neurons in the medial vestibulospinal tract?
Vestibular nuclei → spinal motor neurons
49
What are the second order neurons in the medial vestibulospinal tract?
Spinal motor neurons → neck, back, postural muscles
50
Where does decussation occur in the medial vestibulospinal tract?
Brainstem
51
What is the function of the lateral vestibulospinal tract?
Extensor muscles for upright posture
52
What are the first order neurons in the lateral vestibulospinal tract?
Vestibular nuclei → spinal motor neurons
53
What are the second order neurons in the lateral vestibulospinal tract?
Spinal motor neurons → extensor muscles
54
Where does decussation occur in the lateral vestibulospinal tract?
Uncrossed
55
What is the function of the rubrospinal tract?
Fine motor control of UE
56
What are the first order neurons in the rubrospinal tract?
Red nucleus → spinal motor neurons
57
What are the second order neurons in the rubrospinal tract?
Spinal motor neurons → UE distal muscles
58
Where does decussation occur in the rubrospinal tract?
Midbrain

Lauren (93 decks)

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