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CNS > Exam 3: Ascending Tracts > Flashcards

Exam 3: Ascending Tracts Flashcards

1
Q

Cervical and lumbar enlargements are seen in _____ matter

A

grey

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2
Q

White matter is most abundant

A

superiorly

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3
Q

Typical lower motor neuron

A

Alpha motor neuron

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4
Q

Which motor neuron goes to muscle spindles (stretch receptor)?

A

gamma motor neuron

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5
Q

Propriospinal

A

communicate between two sides of SC

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6
Q

Lamina of Rexed

A

layers of grey matter, I-X

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7
Q

Spinal Ganglia

A
  • unipolar
  • centrifugal
  • centripetal
  • thoracic - 50,000
  • cervical and lumbar - 100,000
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8
Q

Spinal ganglia enters both ____ and _____ roots

A

dorsal and ventral

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9
Q

Centripetal towards

A

CNS

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10
Q

Centrifugal towards

A

receptor ganglia enlarged due to innervating extremities

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11
Q

Conscious sensation is perceived by the

A

cerebral cortex (telencephalon)

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12
Q

Conscious Sensation: Exteroceptive

A

vision, hearing, touch, pressure, heat, cold, pain - outside world

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13
Q

Conscious Sensation: Proprioceptive

A

position sense, kinesthetic sense (activate/inactivate muscles; posture)

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14
Q

Unconscious sensation is perceived by the

A

cerebellum (metencephalon)

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15
Q

Unconscious Sensation: Proprioception

A

motor coordination

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16
Q

Unconscious Sensation: Enteroception

A

visceral reflexes

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17
Q

First order neuron is in

A

DRG

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18
Q

Second order neuron’s cell body is

A

ipsilateral

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19
Q

Second order neuron’s axon terminates in the

A

contralateral thalamus

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20
Q

Third order neurons are in the thalamus and project to

A

somatosensory cortex

21
Q

Somatic sensory pathways II are

A
  • somatotopic

- modulated by interneurons

22
Q

Dorsal column - medial lemniscus: function

A
  • proprioception

- discriminative touch

23
Q

Dorsal column - medial lemniscus: first order

A

DRG

24
Q

Dorsal column - medial lemniscus: second order

A

N. cuneatus; N. gracilis

25
Q

Dorsal column - medial lemniscus: third order

A

VPL

26
Q

Dorsal column - medial lemniscus: tracts

A
  • Fasciculus Gracilus, F. Cuneatus
  • Medial Lemniscus
  • Corona Radiata
27
Q

Dorsal column - medial lemniscus: tracts

Where do the fibers cross?

A

medulla

28
Q

Internal capsule is towards the

A

thalamus

29
Q

ALS function

A
  • pain
  • temperature
  • crude touch
30
Q

ALS: Direct pathway

A

spinothalamic tract

31
Q

ALS: Indirect pathway

A

spinoreticular tract

32
Q

Spinothalamic: Lateral function

A
  • noxious

- thermal

33
Q

Spinothalamic: Anterior function

A

light touch

34
Q

Spinothalamic: second order

A

I, IV, V, III

35
Q

Spinothalamic: third order

A

VPL

36
Q

Spinothalamic: tracts

A
  • ALS

- spinal lemniscus

37
Q

Spinothalamic:

Where do the fibers cross?

A

anterior white commissure

  • lateral: 1 segment
  • anterior: over several segments
38
Q

Spinoreticular (Paleospinothalamic) Functions:

A
  • awareness

- emotion of sensation

39
Q

Spinoreticular (Paleospinothalamic): second order

A

V, VI, VII

40
Q

Spinoreticular (Paleospinothalamic):

Where does it end?

A

reticular formation

41
Q

Spinoreticular (Paleospinothalamic) has no

A

somatotopography

42
Q

Posterior spinocerebellar

A
  • unconscious proprioception (leg)
  • second order - Dorsal N. Clarke (VII)
  • gracile fasciculus
  • inferior cerebellar peduncle
43
Q

Cuneocerebellar

A
  • unconscious proprioception (arm)
  • second order - accessory cuneate nucleus
  • cuneate fasciculus
  • inferior cerebellar peduncle
44
Q

Cerebellar tracts monitors

A

reflex arc

45
Q

Anterior spinocerebellar

A
  • crossed

- superior cerebellar peduncle

46
Q

Rostral Spinocerebellar

A
  • superior and inferior cerebellar peduncle

- uncrossed

47
Q

Spinotectal turns head towards

A

stimulus

48
Q

Spinoolivary

A

cutaneous and proprioceptive

CNS (3 decks)

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