Clinically Relevant Anatomy of Spinal Nerves

Question 1

is loss of coordnation/balance/clumsiness a sensory or motor symptom

Answer 1

both

Question 2

which spinal level has no significant cutaneous sensory axons

Answer 2

C1

Question 3

which dermatome does the pubic symphysis correspond to

Answer 3

T12

Question 4

where do the posterior rami suply

Answer 4

• synovial joints of vertebrae
• deep muscles of back
• strip of skin centrally down back and posterior neck

Question 5

which nerve roots are the iliohypogastric and ilioinguinal nerves made up of

Answer 5

half of L1 each

Question 6

which nerve root is the subcostal nerve made up of

Answer 6

T12 anterior ramus

Question 7

named nerve cutaneous innervation of the head and neck

Answer 7

little goats tread softly

Question 8

where is the nerve point of the neck found

Answer 8

midpoint of posterior border of SCM

Question 9

named nerve cutaenous innervation

Answer 9

Question 10

referred pain from diaphgram

Answer 10

• C345
• supraclavicular nerves C3+4 supply cuaneous innveration to shoulder
• –> referred pain from diaphgram/liver pathology

Question 11

through which spinal nerves is pain from myocardium, eg heart attack, referred

Answer 11

T1+2 anterior rami

Question 12

named nerve cutaenous innervation

Answer 12

Question 13

clinical testing of myotomes C5-T1

Answer 13

Question 14

clinical testing of myotomes L3-S2

Answer 14

Question 15

outline the steps in a tendon reflex

Answer 15

• eg patellar tendon
• tap tendon
• stretch muscle fibres
• initiate AP in anterior rami axons in femoral nerve
• sensory APs conducted to dorsal horn of L3
• axons pass into anterior horn and synapse on LMNs that supply quadriceps
• APs conducted via LMN axons in femoral nerve to reach quadriceps NMJ
• muscle contracts to extend knee joint

Question 16

what type of reflex is the stretch reflex

Answer 16

monosynaptic reflex

Question 17

triceps brachii reflex vertebral level

Answer 17

C7

Question 18

biceps brachii reflex vertebral level

Answer 18

C5 and 6

Question 19

brachioradialis reflex vertebral level

Answer 19

C6

Question 20

knee jerk reflex vertebral level

Answer 20

L3

Question 21

ankle jerk reflex vertebral level

Answer 21

S1

Question 23

C2 dermatome

Answer 23

back of scalp and adam’s apple

Question 24

C3 dermatome

Answer 24

back of neck and jugular notch

Question 25

C4 dermatome

Answer 25

clavicle and shoulder tip

Question 26

little finger dermatome

Answer 26

C8

Question 27

thumb dermatome

Answer 27

C6

Question 28

middle finger dermatome

Answer 28

C7

Question 29

badge patch dermatome

Answer 29

C5

Question 30

anterior leg dermatome

Answer 30

Question 31

posterior leg dermatomes

Answer 31

Question 32

posterior knee

Answer 32

S2

Question 33

dorsum of foot

Answer 33

L5

Question 34

medial malleolus

Answer 34

L4

Question 35

buttock dermatome

Answer 35

S3

Question 36

perineum and perianal skin dermatome

Answer 36

S4 ad S5

Question 37

heel dermatome

Answer 37

S1

Question 38

anterior thigh and knee dermatome

Answer 38

L2 and 3

Question 39

cervical plexus