Intro to PNS: Spinal Cord and Spinal Nerve

Question 1

central nervous system

Answer 1

brain and spinal cord

Question 2

peripheral nervous system

Answer 2

12 cranial nerves

31 pairs of spinal nerves

Question 3

gray matter

Answer 3

cell bodies

anteiror, lateral, posterior horn

Question 4

white matter

Answer 4

fibers

posterior, lateral, anterior funiculi

Question 5

lateral column

Answer 5

gives rise to autonomic nerve fibers

Question 6

pseudounipolar

Answer 6

in dorsal root ganglion
-has peripheral and central processes

sensory

Question 7

funiculi

Answer 7

fiber tracts

Question 8

posterior funiculi

Answer 8

sensory

Question 9

lateral and anterior funiculi

Answer 9

mixed tracts

Question 10

spinal cord segment

Answer 10

rootles that form single spinal nerve

Question 11

dorsal and ventral rami

Answer 11

ventral larger

mixed nerve

Question 12

spinal column segment

Answer 12

vertebrae

Question 13

do spinal cord and column segments coincide?

Answer 13

nope

Question 14

nucleus

Answer 14

cell bodies in the CNS

Question 15

ganglia

Answer 15

cell bodies in PNS

Question 16

motor neurons

Answer 16

ventral roots

Question 17

sensory neurons

Answer 17

dorsal roots

Question 18

IMLCC

Answer 18

lateral horn

-intermediolateral cell column

Question 19

lateral horn

Answer 19

autonomic pre-ganglionic neurons

Question 20

ventral horn

Answer 20

fibers innervate skeletal muscles

Question 21

funiculi

Answer 21

fiber bundle of fasiculi in white matter

Question 22

ganglia

Answer 22

contain cell bodies of all afferent fibers (except vagus) below level of head

Question 23

three things dorsal rami innervate

Answer 23

deep back, joints of spine, skin of back

Question 24

where does first spinal nerve exit?

Answer 24

between skull and CV1

Question 25

dorsal primary ramus

Answer 25

fibers of all types

-innervates deep back, joints of spine, and skin of back

Question 26

ventral primary ramus

Answer 26

fiber of all types
-innervates limbs and ventral torso

form all somatic nerve plexuses of body

Question 27

what forms somatic nerve plexuses

Answer 27

ventral primary rami

Question 28

general somatic afferent fiber

Answer 28

from skeletal muscles (proprioception) and skin (exteroceptive)

Question 29

cervical plexus

Answer 29

C1-C5

Question 30

brachial plexus

Answer 30

C5-T1

Question 31

Intercostal Nerves

Answer 31

T1-T12

Question 32

Lumbar Plexus

Answer 32

L1-L4

Question 33

general visceral afferent fiber

Answer 33

carry sensory information from internal structures (interoceptive)

Question 34

general somatic efferent fibers

Answer 34

motor innervation of skeletal muscle

Question 35

general visceral efferent fiber

Answer 35

autonomic motor innervation of smooth muscle, cardiac muscle and glands

Question 36

segmental innervation

Answer 36

result of early contact of developing nerve fibers

Question 37

single spinal nerve

Answer 37

can send signal to many peripheral nerve

Question 38

single peripheral nerve

Answer 38

can send signals to many spinal nerves

Question 39

visceral stuctures don’t forget

Answer 39

blood vessel, erector pilae, sweat gland

Question 40

afferent fibers

Answer 40

cell bodies in dorsal root ganglia

Question 41

only spinal nerve without DRG?

Answer 41

spinal nerve C1

Question 42

where do you find all afferent fiber cell bodies?

Answer 42

DORSAL ROOT GANGLIA! **

Question 43

all cell bodies for skeletal muscle motor activity

Answer 43

anterior horn

except in head

Question 44

if a spinal nerve is severed?

Answer 44

it cannot ablate an entire dermatome or paralyze an entire muscle

Question 45

dermatome

Answer 45

area of skin innervated by single spinal nerve

Question 46

sensory distribution

Answer 46

radially

Question 47

motor distribution

Answer 47

longitudinally

Question 48

what else is important?

Answer 48

dermatome and peripheral innervation maps are different

1 to 1 correlation is intercostal area!