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Anatomy > PNS > Flashcards

PNS Flashcards

1
Q

How many pairs of spinal nerves exit the spinal cord in the different regions of the spinal cord?

A

12

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2
Q

What are dermatomes? What is their clinical significance?

A
  • Map showing the relationship between sensory receptors of the skin and the spinal nerves
  • Useful in clinical setting when trying to determine if there has been spinal cord or spinal nerve damage
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3
Q

What is shingles?

A

Varicella-zoster virus resides in single dorsal root ganglion. The lesions are located within a dermatome

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4
Q

Detail the flow of information through the nervous system

A

Sensory receptors -> sensory neurons -> PNS -> CNS (integration) -> PNS -> motor neurons

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5
Q

Stimulus that causes excitation for Chemoreceptor

A

chemicals

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6
Q

Stimulus that causes excitation for Nociceptor

A

Pain

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7
Q

Stimulus that causes excitation for Pacinian corpuscle

A

Responds to deep pressure

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8
Q

Stimulus that causes excitation for Thermoreceptor

A

temperature changes

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9
Q

Stimulus that causes excitation for Proprioceptor

A

stretch in their
locomotory organs

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10
Q

Stimulus that causes excitation for Photoreceptor

A

Light

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11
Q

Stimulus that causes excitation for Messner’s corpuscle

A

Responds to light, discriminative touch

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12
Q

Stimulus that causes excitation for Ruffini ending

A

deep pressure, stretch

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13
Q

Stimulus that causes excitation for Root hair plexus

A

movement (deflection) of the hair

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14
Q

Stimulus that causes excitation for Itch receptor

A

inflammatory chemicals

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15
Q

Which spinal nerves contribute to these plexuses?
* Cervical
* Brachial
* Lumbar
* Sacral

A
  • Cervical : C1-C5
  • Brachial : C5-T1
  • Lumbar : L1-L4
  • Sacral : L4-S4
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16
Q

Explain why there isn’t a thoracic plexus.

A

The thoracic nerves innervate the chest. They go directly into organs.

17
Q

What is polio?

A

Virus that in some individuals targets motor neurons

18
Q

What is postpolio syndrome?

A

People who had polio, 30 years later experience muscle weakening.

Anatomy (18 decks)

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