Anatomy > Peripheral Nerves > Flashcards

Peripheral Nerves Flashcards

(23 cards)

Study These Flashcards
1
Q

How can one input lead to 2 specific outputs?

Remeber PNS

A
  • If sensory neuron synapses with a inhibitory interneuron

(on its way to the motor neuron)

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2
Q

Which part of the spinal cord has a root ganglion?

dorsal or ventral?

A

Dorsal!

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3
Q

What is the function of the perineurium/endoneurium/epineurium?

+ what they are

A
  • Sheath of connective tissue
  • Gives structural rigidity and flexibility
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4
Q

Why does the PNS require a sheath of connective tissue - and the CNS doesnt?

A
  • PNS moves a lot so it needs encasing
  • CNS doesnt move
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5
Q

What does a schwann cell do?

A

Surroundes every axon in the PNS

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6
Q

What is this?

A
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6
Q

What is a fascicle?

A
  • Bundle of axons wrapped in perineurium
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7
Q

What is this?

A
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8
Q

What is this?

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9
Q

What is this?

A
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10
Q

What is this?

A
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11
Q

What is this?

A
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12
Q

What is the process of myelination?

A
  • Glial cell wraps around axon
  • Cytoplasm squeezed out as sheath forms
  • Myelin sheath acts as insulation
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13
Q

What do we call the gaps in the myelin?

A

Nodes

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14
Q

How does myelination allow for fast axonal conduction?

A
  • Allows ‘jumping conduction’ from node to node
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15
Q

How can we increase the speed of conduction?

Study These Flashcards
A
  • Increase internodal distance
  • No myelin but, thicker axon
16
Q

What is this?

17
Q

What is this?

18
Q

What is this?

19
Q

What is this?

20
Q

What is this?

21
Q

How does myelin affect the speed signals travel?

Study These Flashcards
A
  • Myelin insulates the cell
  • Which allows for more charge to be conserved (And not leave) at internodes
  • The myelin-less nodes then will experience sufficient energy to open up the Na gates
  • The Na gates speed up signal transfer (as it is via diffusion)
22
Q

How do nerves regenerate after an axon is damaged?

Study These Flashcards
A
  1. Schwann cells repair while SC and macrophages clean up
  2. Muscle accepts regenerated axon, protein synthesis occurs and axon regenerated
  3. Regeneration may fail if axons are unable to regenerated &muscle prevent reinnervation
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