Ch. 12: Peripheral NS Flashcards

1
Q

Peripheral Nerve

A
  • distal axon projections

- After nerve leaves spinal canal

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2
Q

Cervical Plexus

A
  • C1-C4

- motor, sensory, sympathetic to neck and tops of shoulders

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3
Q

Brachial Plexus

A
  • C5-C8, T1

- Motor, sensory, sympathetic to arms

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4
Q

Sacral Plexus

A
  • L4-S4

- motor, sensory and parasympathetic to back and bottom of legs

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5
Q

Damage to spinal nerve causes:

A
  • minor weakness to 1+ muscles
  • (b/c Mm are innervated by more than one spinal level)

-sensory loss in dermatomal pattern

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6
Q

Damage to Peripheral Nerve Causes:

A
  • paralysis to 1+ Mm
  • (b/c a muscle is only supplied by one peripheral nerve)

-sensory loss in peripheral pattern

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7
Q

Spinal Nerve at risk from:

A
  • bulging disc

- collapse of intervetebral foramen

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8
Q

Lumbar Plexus

A
  • L1-L4

- motor, sensory, sympathetic to front of legs

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9
Q

Principles of a plexus

A
  • one peripheral nerve gets axons from many different spinal levels
  • one spinal level sends axons to many different peripheral nerves
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10
Q

Spinal Nerve

A
  • joining of one spinal level
  • all sensory, motor and autonomic
  • dividing line between central and peripheral NS
  • dermatomal/myotomal pattern when damaged
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11
Q

Rami

A
  • ventral
  • dorsal
  • communicating
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12
Q

Axon Connective Sheaths

A
  • endoneurium
  • perineurium
  • epineurium
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13
Q

Nerves and movement

A
  • nerves love blood, space and movement
  • Movement increases blood flow, facilitates gliding of N, and axoplasmic transport
  • nerve axons have wrinkling in endoneurium to allow movement
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14
Q

If nerves can’t move:

A

the axons stick to connective tissue and shorten

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15
Q

Dysfunction of peripheral Nn

A
  • Sensory changes
  • Motor changes
  • Autonomic changes
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16
Q
Autonomic changes
(peripheral nerve damage)
A
  • decreased function
  • decreased sympathetic function

(there is no parasympathetic in peripheral nerves)

17
Q

NMJ

A
  • EPSP only

- atrophy of denervation if axons die

18
Q

Sensory Changes

damage to pheripheral nerve

A
  • location depends on where it’s damaged
  • depends on how much damage
  • Anesthetic/Analgesic or both
19
Q

Motor damage

to peripheral nerve

A
  • location depends on what’s damaged

- severity depends on how much damage

20
Q

changes following denervation

A
  • fibrillations

- trophic changes (to nerve, muscle, skin)

21
Q

Traumatic Axonopathy

A
  • axon and myelin degenerate, but connective tissue tube remains
  • Wallerian degeneration distal
  • Recovery: good
22
Q

Axon regrowth rate

A

1 inch/month

23
Q

Multiple mononeuropathy

A

-involves 2+ discrete Nn in different body parts

24
Q

Classification of peripheral neuropathies

A
  • mononeuropathy
  • multiple mononeuropathy
  • Polyneuropathy
25
Q

Traumatic Myelinopathy

A
  • temporary disruption of conduction along axon membrane
  • axon intact
  • demyelination possible
  • Recovery: excellent
  • +Tine’s sign (b/c demyelinated areas upregulate mechanoreceptors)
26
Q

Severance

A
  • axon/myelin degenerate and connective tissue tube is severed
  • wallerian degeneration distal
  • Recovery: fair
  • axons may not find connective tissue tube (can form neuroma)
  • may go into other tube and become nonfunctional
27
Q

Polyneuropathy

A
  • decreased sensory, motor, autonomic starting distal and working to proximal
  • no peripheral or dermatomal pattern
28
Q

Causes of Polyneuropathy

A
  • diabetes
  • Alcoholism (nutritional deficiencies)
  • autoimmune (guillain barre)
29
Q

Mononeuropathy Levels

A
  • traumatic myelinopathy
  • traumatic axonopathy
  • severance