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Flashcards in peripheral nerves Deck (44):
1

basic definitionof peripheral nerves

anything outside of nervous systme (like sciatic nerve)

2

epineurium

outermost covering

3

epineurium is a continuation of

duramater and ahs vessels for nutrients

4

which covering varies in size

epineurium

5

perineurium is a continuation of

arachnoid mater

6

what is function of perineurium

mechanical strength,biochemical strength and preserve iionic environment

7

endoneurium continuation/extension of

pia mater

8

function of endoneurium

protects motor nerve fibers

9

what is the innermost layer of peripheral nerve

endoneurium

10

what is the interstitial tissue around nerve fascicles

perineurium

11

whats fascicle

small bunder/cluster of nerves

12

what is a lamellar sheath that encompasses each fascicle

perineurium

13

function of epineurium

cushions nerve during movement and maintians oxygen supply

14

epineurium maintinas oxygen supply via the

epineural blood supply

15

tensile force is like

distraction , makes it longer and narrow

16

strain is due to

stress

17

internal is

stress

18

external is

strain

19

what is the elastic limit of peripheral tensile forces

20% elongation

20

end of plastic limit for peripheral nerves tensile is

30% elongation

21

injury increases the () of a nerve

stiffness of a nerve

22

on a graph the () the slope the () the material

steaper, stiffer (closer to y axis)

23

straight leg raise test

sciatic nerve and how strong hanstrimg and lumbar mobility

24

at () - () degrees you get slack in sciatic /aborization / just moving it

0-35 degrees

25

what degrees get sciatic root has greater tensile

35-70

26

over what degree get no further deformation of roots, it relaxes but now get meninegeal and dural pulling

over 70 degrees

27

put you fingers on () and () when you go past 70 degrees and feel () and ()

L5, S2, feel s2 put pressure on ginger and back flatten out

28

tourniquet compression

equal distribution of pressure around the nerve ex: ivf

29

ballon technique (compression)

one sided compressive force ex: IVDs

30

two types of comperssion

tourniquet and balloon

31

what force can the body not handle

shear

32

body can withstand

torniquet

33

when you get a touniquet compression you also get

edge effect (is a shear force)

34

what part of peripheranl nerve gets shear/edge

epineurium, peri, endo

35

what keeps area open for discs?

osteophytes

36

what can put tensile probelms on ligaments

poor diet, too much sugar relaxes ligements so get loose and bone hypermobile now

37

piriformis syndrom is a () compression

ballooning by compressing sciatic

38

levels of sciatic nerve

L4-s3 ventral rami

39

well leg raise how do it and findings

pull healthy leg and hurts other side, show tumor, osteophyte, disc problem

40

what force is most detrimental to the nerve

edge effect/ shear force

41

peripheral neuropathy

involves peripheral nerve, covers multiple dermatomes areas from a plexus (like ulna)

42

radiculopathy

involves one spinal nerve root

43

things to consider to differentiate from rediculopathy and neuropathy

1. dermatomal vs peripheral sensory patterns (peripheral from plexus)
2. deep tendon reflexes (DTRS)
3. specific muscle testings

44

sciatic nerve covers

posterior thigh and all of lower extermity