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Neuro Unit 2 > Pathways > Flashcards

Pathways Flashcards

1
Q

Dorsal Column Medial Lemniscus conveys what info?

A

mechanical
conscious proprioception
from the body

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2
Q

Dorsal Trigeminothalamic conveys what info?

A

mechanical
conscious proprioception
from the head/neck

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3
Q

Dorsal Spinocerebellar conveys what info?

A

non-conscious proprioception
from LE & trunk below T1

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4
Q

Cuneocerebellar conveys what info?

A

non-conscious proprioception
from UE & trunk T1 and above

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5
Q

Spinolivary conveys what info?

A

non-conscious proprioception
from limbs
(just an additional pathway in addition to Dorsal Spinocerebellar & Cuneocerebellar)

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6
Q

Dorsal Column Medial Lemniscus cell body locations

A
  1. DRG
  2. Caudal Medulla (Gracile or Cuneate nucleus)
  3. VPL in thalamus
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7
Q

Dorsal Column Medial Lemniscus (Lower Limb) pathway

A

N1 - enters spinal cord, ascends up Dorsal Column.
N1 synapse on N2 - Gracile Nucleus.
N2 - crosses over, ascends up Medial Lemniscus.
N2 synapse on N3 - VPL.
N3 - ascends up Internal Capsule to primary sensory cortex (medially).

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8
Q

Dorsal Column Medial Lemniscus (Upper Limb) pathway

A

N1 - enters spinal cord, ascends up Dorsal Column.
N1 synapse on N2 - Cuneate Nucleus.
N2 - crosses over, ascends up Medial Lemniscus.
N2 synapse on N3 - VPL.
N3 - ascends up Internal Capsule to primary sensory cortex (more laterally).

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9
Q

Dorsal Trigeminothalamic cell body locations

A
  1. Trigeminal Ganglion
  2. Main/Principle Trigeminal nucleus (in pons)
  3. VPM of thalamus
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10
Q

Dorsal Trigeminothalamic pathway

A

N1 - goes thru Trigeminal Ganglion, enters brainstem.
N1 synapse on N2 - Main/Principle Nucleus of Trigeminal.
N2 - crosses over, ascends up Dorsal Trigeminothalamic Tract.
N2 synapse on N3 - VPM.
N3 - ascends up Internal Capsule to primary sensory cortex.

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11
Q

Dorsal Spinocerebellar pathway

A

N1 - afferent from muscle spindles, enters Clarke’s Nucleus (thoraco-lumbar dorsal horn of spinal cord).
N1 synapse on N2 - Clarke’s.
N2 - ascends ipsilaterally & passes thru Inferior Cerebral Peduncle to get to cerebellum.

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12
Q

Cuneocerebellar pathway

A

N1 - afferent from muscle spindles, enters dorsal column, ascends ipsilaterally.
N1 synapse on N2 - Accessory (External) Cuneate Nucleus (just above Cuneate Nucleus in medulla).
N2 - passes thru Inferior Cerebral Peduncle to get to cerebellum.

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13
Q

Spinolivary pathway

A

N1 - enters spinal cord, crosses over, ascends to Inferior Olive Nucleus (in medulla).
N1 synapse on N2 - Inferior Olive Nucleus.
N2 - crosses back over, passes thru Inferior Cerebral Peduncle to get to cerebellum.

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14
Q

What is #1? What pathway(s) travel here?

A

Dorsal Column
Path: Dorsal Column Med Lemniscus from Lower Limb

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15
Q

What is #2? What pathway(s) travel here?

A

Dorsal Column
Path: Dorsal Column Med Lemniscus from Upper Limb & Cuneocerebellar.

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16
Q

What is #3?

A

Lissauer’s Tract

17
Q

What pathway travels through #4?

A

Dorsal Spinocerebellar

18
Q

What pathway travels through #5?

A

Spinothalamic

19
Q

What pathway travels through #6?

A

Spinolivary

20
Q

Spinothalamic Tract conveys what info?

A

Pain/temp from body

21
Q

Spinothalamic cell body locations

A
  1. DRG
  2. Dorsal horn of spinal cord
  3. VPL of thalamus
22
Q

Spinothalamic pathway

A

N1 - enters spinal cord at dorsal horn.
N1 immediately synapses on N2.
N2 - crosses immediately (in spinal cord), ascends up Spinothalamic Tract.
N2 synapses on N3 - VPL.
N3 - passes thru Internal Capsule to primary sensory cortex (LE more medial, UE more lateral).

23
Q

Lissauer’s Tracts

A

Part of the Spinothalamic Pathway.
Once N1 hits dorsal horn, branches into collaterals.
Collaterals go up/down 1-2 segments.
Each collateral synapses on an N2 & follows the same remaining steps of the Spinothalamic Pathway.

24
Q

Affective-Motivational Pain Pathways convey what information?

A

Unpleasent quality of pain

25
Q

Affective-Motivational Pain Pathways originate from where?

A

Spinothalamic Pathway (branches off)

26
Q

Affective-Motivational Pain Pathways project where?

A
  1. Reticular Formation (medulla)
  2. Parabrachial Nucleus (pons)
  3. Intralaminar Nuclei (thalamus)
27
Q

Affective-Motivational Pain Pathways: after reaching the Parabrachial Nucleus, where is their final destination?

A

Hypothalamus & Amygdala (emotion)
Periaqueductal Gray Matter (monitors descending pathways)

28
Q

Affective-Motivational Pain Pathways: after reaching the Intralaminar Nuclei, where is their final destination?

A

Frontal Lobe
Insula & Cingulate Cortex (emotion)

29
Q

Ventral Trigeminothalamic Tract conveys what info?

A

Pain/temp from face

30
Q

Ventral Trigeminothalamic Tract cell body locations

A
  1. Trigeminal Ganglion
  2. Spinal Nucleus of Trigeminal
  3. VPM
31
Q

Ventral Trigeminothalamic Tract pathway

A

N1 - goes thru Trigeminal Ganglion, enters pons, descends down to medulla.
N1 synapse on N2 - Spinal Nucleus of Trigeminal (medulla).
N2 - crosses over, ascends up Ventral Trigeminothalamic Tract.
N2 synapse on N3 - VPM.
N3 - ascends thru Internal Capsule to primary sensory cortex.

32
Q

Horizontal Gaze pathway (looking to the RIGHT in this case)

A
  1. LEFT Frontal Eye Field & LEFT Superior Colliculus activate (receive info from retina).
  2. Projects to RIGHT PPRF (in brainstem).
  3. PPRF projects to RIGHT Abducens Nucleus.
    4a. Abducens sends LMNs to RIGHT Lateral Rectus.
    4b. Abducens sends Internuclear Neurons to LEFT Oculomotor Nucleus.
  4. Oculomotor sends LMNs to LEFT Medial Rectus.

Neuro Unit 2 (10 decks)

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