Spinal Nerve Roots (Lecture #15)

Question 1

where can the dorsal root ganglion be found? (landmark)

Answer 1

intervertebral foramen

Question 2

dorsal root

Answer 2

first order sensory axons entering the spinal cord from a specific dermatome

Question 3

ventral root

Answer 3

LMN axons leaving the spinal cord to go to that spinal cord level’s myotome

Question 4

“nerve root” usually referes to

Answer 4

mixed spinal nerve

Question 5

dermatome of back of head

Answer 5

C2

Question 6

dermatome of nipples

Answer 6

T4

Question 7

dermatome of umbilicus

Answer 7

T10

Question 8

dermatome of “saddle area”

Answer 8

S3,4,5

Question 9

dermatome of thumb

Answer 9

C6

Question 10

dermatome of middle finger

Answer 10

C7

Question 11

dermatome of little finger

Answer 11

C8

Question 12

dermatome of medial calf

Answer 12

L4

Question 13

dermatome of lateral calf and big toe

Answer 13

L5

Question 14

dermatome of little toe and sole of foot

Answer 14

S1

Question 15

what space is the cauda equina found in

Answer 15

subarachnoid space

Question 16

radiculopathy

Answer 16

sensory or motor dysfunction caused by injury to a nerve cell

Question 17

muscle associated with C5 nerve root

Answer 17

deltoid (C5,6)

Question 18

reflex associated with C5 nerve root

Answer 18

biceps (C5,6)

brachioradialis (C5,6)

Question 19

dermatome associated with C5 nerve root

Answer 19

lateral upper arm over deltoid

Question 20

muscle associated with C6 nerve root

Answer 20

biceps (C5,6)
wrist extensors (C5,6,7,8)

Question 21

reflex associated with C6 nerve root

Answer 21

biceps (C5,6)

brachioradialis (C5,6)

Question 22

dermatome associated with C6 nerve root

Answer 22

thumb/lateral arm

Question 23

muscle associated with C7 nerve root

Answer 23

triceps (C6,7,8)

Question 24

reflex associated with C7 nerve root

Answer 24

triceps (C6,7,8)

Question 25

dermatome associated with C7 nerve root

Answer 25

middle finger and middle of hand

Question 26

muscle associated with L4 nerve root

Answer 26

quads (L2,3,4)

Question 27

reflex associated with L4 nerve root

Answer 27

patellar (L4)

Question 28

dermatome associated with L4 nerve root

Answer 28

medial leg below knee

Question 29

muscle associated with L5 nerve root

Answer 29

tibialis anterior (L4,5)

Question 30

reflex associated with L5 nerve root

Answer 30

none

Question 31

dermatome associated with L5 nerve root

Answer 31

lateral leg below the knee; usually includes big toe

Question 32

muscle associated with S1 nerve root

Answer 32

gastroc/soleus (S1,2)

Question 33

reflex associated with S1 nerve root

Answer 33

achilles (S1)

Question 34

dermatome associated with S1 nerve root

Answer 34

lateral aspect of foot, little toe, sole of foot

Question 35

what nerve roots are affected in cauda equina syndrome

Answer 35

L2 and below

Question 36

what spinal level can you find conus medularis

Answer 36

L1