3.7 PNS stuff 2 Flashcards

1
Q

“unmyelinated”

A

shares myelin with other cells

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2
Q

each PNS axon is myelinated and coated with

A

endoneurium

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3
Q

fascicle

A

bundle of axons coated with perineurium

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4
Q

epineurium

A

coats bundle of fascicles (nerve)

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5
Q

mesoneurium

A
  • coats the epineurium

- connective tissue that protects the fascicles

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6
Q

perineurium

A
  • continuous with arachnoid mater

- forms the blood nerve barrier

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7
Q

blood nerve barrier

A

protective mechanism to keep toxins from getting into the nerves

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8
Q

ramus

A

division/offshoot of a spinal nerve

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9
Q

ventral rami innervate

A

lateral anterior regions

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10
Q

dorsal rami innervate

A

paravertebral (midline posterior) and intercostals

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11
Q

in a PNS nerve bundle, there what signals are happening?

A

afferents AND efferents

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12
Q

peripheral nerves (signals)

A
  • peripheral nerve ⟺ viscera (autonomic)
  • peripheral nerve ⟺ somatic » motor

sensory » somatic

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13
Q

sensory » cutaneous

A

cutaneous » sweat glands, arterioles, sympathetic efferents

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14
Q

muscular

A

can be either muscular or can get proprioceptive input

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15
Q

What are the plexuses?

A
  • cervical
  • brachial
  • lumbar
  • sacral
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16
Q

cervical plexus consists of

A

C1-C5
» skin of neck, back of scalp
» deep neck muscles

17
Q

C3-C5 »

A

phrenic nerve

18
Q

phrenic nerve innervates

A

diaphragm

19
Q

most important output of the cervical plexus

A

phrenic nerve

20
Q

brachial plexus runs from

A

C5-T1

21
Q

5 major nerves of brachial plexus

A
  • musculocutaneous
  • axillary
  • median
  • radial
  • ulnar
22
Q

musculocutaneous nerve

A
  • bicep
  • brachialis
  • overlying skin
23
Q

axillary nerve

A
  • deltoid
  • teres minor
  • overlying skin
24
Q

median nerve

A
  • anterior forearm

- skin of lateral hand

25
Q

radial nerve

A
  • triceps and overlying skin
  • back of forearm

*follows radius

26
Q

ulnar nerve

A
  • medial part of hand
  • forearm
  • overlying skin
27
Q

lumbar plexus levels

A
  • L1-L4
28
Q

2 major nerves of lumbar plexus

A
  • femoral nerve

- obturator nerve

29
Q

femoral nerve:

A
  • anterior leg
  • quad
  • overlying skin
30
Q

femoral nerve branch

A

forms saphenous nerve (bottom part of leg)

31
Q

obturator nerve

A
  • adductors

- overlying skin

32
Q

sacral plexus levels

A

L4-S4

33
Q

major nerve of sacral plexus

A

sciatic nerve

34
Q

sciatic nerve consists of

A
  • tibial nerve

- peroneal nerve

35
Q

tibial nerve

A
  • posterior thigh
  • posterior LE
  • foot
  • overlying skin
36
Q

peroneal nerve

A
  • lower anterolateral leg
  • deep foot muscles
  • overlying skin
37
Q

5 major things that can happen with PNS lesions

A
  • paralysis
  • paresis
  • loss of sensation
  • muscle weakness (atrophy)
  • reduced or absent reflexes