Spinal Cord and Spinal Nerves

Question 1

nerve cell bodies arranged in areas called hors form ____

Answer 1

gray matter in the spinal cord

Question 2

bungles of myelinated axons called tracts arranged as ascending (sensory) and descending (motor) tracts form ____

Answer 2

white matter in the spinal cord

Question 3

organization of grey matter:

most posterior structures are sensory

Answer 3

posterior gray horns

Question 4

organization of grey matter:

visceral motor nuclei (organs)

Answer 4

lateral gray horns

Question 5

organization of grey matter:

most anterior structures are motor

Answer 5

anterior gray horns

Question 6

What horns of the spinal cord are composed of sensory neuron cell bodies?

Answer 6

dorsal

Question 7

most superficial layer of meninges

Answer 7

dura mater

Question 8

meningeal layer adhered to the internal surface of the skull

Answer 8

endosteal dura mater

Question 9

most superficial meningeal layer surrounding the spinal cord

Answer 9

meingeal dura mater

Question 10

intermediate layer of meninges

Answer 10

arachnoid mater

Question 11

space between arachnoid mater and pia mater

Answer 11

subarachnoid space

Question 12

CSF circulates in the ____ space

Answer 12

subarachnoid

Question 13

most deep layer of meninges

Answer 13

pia mater

Question 14

meningeal layer adhered to the surface of the brain & spinal cord

Answer 14

pia mater

Question 15

formed by nerve cell bodies arranged in areas called ganglia

Answer 15

gray matter in spinal nerves

Question 16

Dorsal root ganglia are composed of ____.

Answer 16

sensory nerve cell bodies

Question 17

formed by bundles of myelinated axons called nerves arranged in groups called plexuses

Answer 17

white matter in spinal nerves

Question 18

branches of spinal nerves:

sensation of the back and deep back muscles

Answer 18

dorsal rami

Question 19

branches of spinal nerves:

sensation and movement of the rest of the body (other than the back and deep back muscles)

Answer 19

ventral rami

Question 20

__ pairs of spinal nerves:

\_\_ cervical pairs
\_\_ thoracic pairs
\_\_ lumbar pairs
\_\_ sacral pairs
\_\_ coccygeal

Answer 20

31 pairs of spinal nerves:

8 cervical pairs
12 thoracic pairs
5 lumbar pairs
5 sacral pairs
1 coccygeal

Question 21

the adult spinal cord ends at the ____ vertebral level

Answer 21

L2

Question 22

nerves hanging below spinal cord

Answer 22

cauda equina

Question 23

functional components of spinal nerves:

dorsal root

Answer 23

sensory only

Question 24

functional components of spinal nerves:

ventral root

Answer 24

motor only

Question 25

functional components of spinal nerves: | spinal nerve

Answer 25

mixed nerve

Question 26

functional components of spinal nerves: | dorsal ramus

Answer 26

mixed nerve

Question 27

functional components of spinal nerves: | ventral ramus

Answer 27

mixed nerve

Question 28

spinal nerve connective tissue covering: | outer layer that becomes continuous with the dura mater

Answer 28

epineurium

Question 29

spinal nerve connective tissue covering: | layer surrounding a fascicle (a bundle of axons)

Answer 29

perineurium

Question 30

spinal nerve connective tissue covering: | layer surrounding a single axon

Answer 30

endoneurium

Question 31

automatic, stereotyped response to stimulus

Answer 31

reflex

Question 32

a response to a withdrawal reflex (left knee extends as right knee reflexes

Answer 32

crossed extensor reflex

Question 33

Stimulating muscle spindles produces a _______ reflex.

Answer 33

stretch reflex

Question 34

reflexive extension of the toes in neonates when the plantar surface is stroked

Answer 34

Babinski's

Question 35

area of skin supplied by one pair of spinal nerves

Answer 35

dermatome

Question 36

bundle of nerves that supply particular region of the body

Answer 36

nerve plexus

Question 37

four nerve plexuses:

Answer 37

cervical, brachial, lumbar, sacral

Question 38

only spinal nerves that do not form a plexus

Answer 38

thoracic

Question 39

nerve from cervical plexus that supplies the respiratory diaphragm (C1-C3)

Answer 39

phrenic nerve

Question 40

major nerves of brachial plexus:

Answer 40

musculocutaneous, median, ulnar, radial, axillary

Question 41

nerve plexus that supplies the UE

Answer 41

brachial

Question 42

major nerves of lumbar plexus:

Answer 42

femoral and obturator

Question 43

spinal cord enlargement that supplies the LE

Answer 43

lumbar

Question 44

a nerve of the lumbar plexus that supplies the LE

Answer 44

femoral

Question 45

major nerves of sacral plexus:

Answer 45

sciatic, pudendal, gluteal

Question 46

a nerve in the sacral plexus that supplies the LE; largest nerve in the body

Answer 46

sciatic nerve

Question 47

components/major branches of sciatic nerve

Answer 47

tibial branch and common peroneal branch