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Physiology NEU 205 > Sensory 3: somatic Sensory Pathways > Flashcards

Sensory 3: somatic Sensory Pathways Flashcards

1
Q

sensations carried on Dorsal Column pathway

A

Mechanoceptive:
* Fine touch
* Fine pressure
* Vibration
* Stereognosis
* Position (propreoception)

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2
Q

Afferent fibers of Dorsal Column pathway

A
  • A Beta (except Proprioception)
  • A alpha (for proprioception)
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3
Q

Receptors for Dorsal Column pathway

A

Mechanoreceptors

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4
Q

1st Order neurone of Dorsal Column Pathway

A

DRG postganglionic fibers ascend upwards Ipsilaterally as cuneate and gracile tract to reach medulla

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5
Q

2nd Order Neurone of Dorsal Column pathway

A

Upon reaching Medulla, fibers from gracile and cunate Nuclei Cross to the other side to VBN & PVN of thalamus

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6
Q

3rd Order Neurone Of Dorsal Column pathway

A

Fibers from thalamus reach somatic sensory cortex ipsilaterlly

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7
Q

Sensations of Lateral spinothalamic Tract

A

Pain & Temperature

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8
Q

Afferent fibers of Lateral spinothalamic Tract

A

C fibers

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9
Q

Receptors of Lateral spinothalamic tract

A

Free Nerve endings

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10
Q

1st order neurone of Lateral spinothalamic

A

DRG postganglionic fibers to ipsilateral dorsal (posterior) horn cells

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11
Q

2nd order neurone of Lateral Spinothalamic tract

A

crosses from dorsal horn cells in front of the Central Canal to opposite site and ascend to PVN of thalamus of that opposite side

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12
Q

3rd Order neurone of Lateral Spinothalamic tract

A

from PVN of thalamus to Somatic sensory cortex ipsilaterally

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13
Q

Sensations of ventral spinothalamic tract

A

Crude sensations + itching & tickling

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14
Q

Afferent fibers of ventral spinothalamic tract

A

A delta fibers

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15
Q

Receptors of ventral spinothalamic tract

A

Free nerve endings

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16
Q

1st order neurone of ventral spinothalamic tract

A

from DRG to Dorsal Horn cells ipsilaterally

17
Q

2nd order neurone of ventral spinothalamic tract

A

from Dorsal horn cells, crossing central canal (further from the canal than Lateral spinothalamic) to the opposite and ascends to thalamus on that opposite side

18
Q

3rd Order neurone ventral spinothalamic tract

A
  • Ascends from PVN of thalamus to Somatic Sensory Coretx ipsilaterally
19
Q

Role of Thalamus in sensory perception

A
  1. all sensory tracts, except olfcotry, synapse in thalamis
  2. Thalamus feels sensations crudely , therefore person can be crudely aware of sensagtion but cannot precievea all fine details

Physiology NEU 205 (24 decks)

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