3.7 PNS stuff 2

Question 1

“unmyelinated”

Answer 1

shares myelin with other cells

Question 2

each PNS axon is myelinated and coated with

Answer 2

endoneurium

Question 3

fascicle

Answer 3

bundle of axons coated with perineurium

Question 4

epineurium

Answer 4

coats bundle of fascicles (nerve)

Question 5

mesoneurium

Answer 5

• coats the epineurium

- connective tissue that protects the fascicles

Question 6

perineurium

Answer 6

• continuous with arachnoid mater

- forms the blood nerve barrier

Question 7

blood nerve barrier

Answer 7

protective mechanism to keep toxins from getting into the nerves

Question 8

ramus

Answer 8

division/offshoot of a spinal nerve

Question 9

ventral rami innervate

Answer 9

lateral anterior regions

Question 10

dorsal rami innervate

Answer 10

paravertebral (midline posterior) and intercostals

Question 11

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

Answer 11

afferents AND efferents

Question 12

peripheral nerves (signals)

Answer 12

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

sensory » somatic

Question 13

sensory » cutaneous

Answer 13

cutaneous » sweat glands, arterioles, sympathetic efferents

Question 14

muscular

Answer 14

can be either muscular or can get proprioceptive input

Question 15

What are the plexuses?

Answer 15

• cervical
• brachial
• lumbar
• sacral

Question 16

cervical plexus consists of

Answer 16

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

Question 17

C3-C5 »

Answer 17

phrenic nerve

Question 18

phrenic nerve innervates

Answer 18

diaphragm

Question 19

most important output of the cervical plexus

Answer 19

phrenic nerve

Question 20

brachial plexus runs from

Answer 20

C5-T1

Question 21

5 major nerves of brachial plexus

Answer 21

• musculocutaneous
• axillary
• median
• radial
• ulnar

Question 22

musculocutaneous nerve

Answer 22

• bicep
• brachialis
• overlying skin

Question 23

axillary nerve

Answer 23

• deltoid
• teres minor
• overlying skin

Question 24

median nerve

Answer 24

• anterior forearm

- skin of lateral hand

Question 25

radial nerve

Answer 25

- triceps and overlying skin - back of forearm *follows radius

Question 26

ulnar nerve

Answer 26

- medial part of hand - forearm - overlying skin

Question 27

lumbar plexus levels

Answer 27

- L1-L4

Question 28

2 major nerves of lumbar plexus

Answer 28

- femoral nerve | - obturator nerve

Question 29

femoral nerve:

Answer 29

- anterior leg - quad - overlying skin

Question 30

femoral nerve branch

Answer 30

forms saphenous nerve (bottom part of leg)

Question 31

obturator nerve

Answer 31

- adductors | - overlying skin

Question 32

sacral plexus levels

Answer 32

L4-S4

Question 33

major nerve of sacral plexus

Answer 33

sciatic nerve

Question 34

sciatic nerve consists of

Answer 34

- tibial nerve | - peroneal nerve

Question 35

tibial nerve

Answer 35

- posterior thigh - posterior LE - foot - overlying skin

Question 36

peroneal nerve

Answer 36

- lower anterolateral leg - deep foot muscles - overlying skin

Question 37

5 major things that can happen with PNS lesions

Answer 37

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