3.7 PNS stuff 2 Flashcards Preview

7303 Neuroanatomy > 3.7 PNS stuff 2 > Flashcards

Flashcards in 3.7 PNS stuff 2 Deck (37):
1

"unmyelinated"

shares myelin with other cells

2

each PNS axon is myelinated and coated with

endoneurium

3

fascicle

bundle of axons coated with perineurium

4

epineurium

coats bundle of fascicles (nerve)

5

mesoneurium

- coats the epineurium
- connective tissue that protects the fascicles

6

perineurium

- continuous with arachnoid mater
- forms the blood nerve barrier

7

blood nerve barrier

protective mechanism to keep toxins from getting into the nerves

8

ramus

division/offshoot of a spinal nerve

9

ventral rami innervate

lateral anterior regions

10

dorsal rami innervate

paravertebral (midline posterior) and intercostals

11

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

afferents AND efferents

12

peripheral nerves (signals)

- peripheral nerve ⟺ viscera (autonomic)
- peripheral nerve ⟺ somatic » motor

sensory » somatic

13

sensory » cutaneous

cutaneous » sweat glands, arterioles, sympathetic efferents

14

muscular

can be either muscular or can get proprioceptive input

15

What are the plexuses?

- cervical
- brachial
- lumbar
- sacral

16

cervical plexus consists of

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

17

C3-C5 »

phrenic nerve

18

phrenic nerve innervates

diaphragm

19

most important output of the cervical plexus

phrenic nerve

20

brachial plexus runs from

C5-T1

21

5 major nerves of brachial plexus

- musculocutaneous
- axillary
- median
- radial
- ulnar

22

musculocutaneous nerve

- bicep
- brachialis
- overlying skin

23

axillary nerve

- deltoid
- teres minor
- overlying skin

24

median nerve

- anterior forearm
- skin of lateral hand

25

radial nerve

- triceps and overlying skin
- back of forearm

*follows radius

26

ulnar nerve

- medial part of hand
- forearm
- overlying skin

27

lumbar plexus levels

- L1-L4

28

2 major nerves of lumbar plexus

- femoral nerve
- obturator nerve

29

femoral nerve:

- anterior leg
- quad
- overlying skin

30

femoral nerve branch

forms saphenous nerve (bottom part of leg)

31

obturator nerve

- adductors
- overlying skin

32

sacral plexus levels

L4-S4

33

major nerve of sacral plexus

sciatic nerve

34

sciatic nerve consists of

- tibial nerve
- peroneal nerve

35

tibial nerve

- posterior thigh
- posterior LE
- foot
- overlying skin

36

peroneal nerve

- lower anterolateral leg
- deep foot muscles
- overlying skin

37

5 major things that can happen with PNS lesions

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