Major Nerves

Question 1

Spinal Cord Segment of Musculocutaneous Nerve

Answer 1

C5,C6,C7

Question 2

Muscles innervated by musculocutaneous nerve

Answer 2

coracobrachialis, biceps brachii, brachialis

Question 3

Sensory distribution of musculocutaneous nerve

Answer 3

anterolateral forearm

Question 4

Motor features of paralysis of musculocutaneous nerve

Answer 4

loss of forearm flexion when supinated, weakened supination

Question 5

spinal cord segment of axillary nerve

Answer 5

C5,C6

Question 6

muscles innervated by axillary nerve

Answer 6

deltoid, teres minor

Question 7

sensory distribution of axillary nerve

Answer 7

lateral arm over lower portion of deltoid

Question 8

motor features of paralysis for axillary nerve

Answer 8

loss of shoulder abduction, weakened external rotaiton

Question 9

spinal cord segment of radial nerve

Answer 9

C5-C8, T1

Question 10

muscles innervated by radial nerve

Answer 10

triceps brachii
anconeus
brachioradialis
supinator
wrist extensors
finger extensors
thumb extensors

Question 11

Motor features of paralysis for radial nerve

Answer 11

elbow extension
wrist extension
finger extension
thumb extension

Question 12

sensory distribution of radial nerve

Answer 12

posterior arm, posterior forearm, radial side of posterior hand

Question 13

spinal cord segments for median nerve

Answer 13

C5-C8, T1

Question 14

muscle innervation for median nerve

Answer 14

pronators
wrist flexors
finger flexors on radial side
most thumb muscles

Question 15

sensory distribution for median nerve

Answer 15

palmar aspects of thumb, seconds, third, and fourth (radial side) fingers

Question 16

motor features of paralysis for median nerve

Answer 16

loss of forearm pronation

thumb opposition, flexion, and abduction

Question 17

spinal cord segment of ulnar nerve

Answer 17

C7,C8,T1

Question 18

muscles innervated by ulnar nerve

Answer 18

flexor carpi ulnaris
flexor digitorum profundus (medial half)
interossei
fourth and fifth lumbricals

Question 19

sensory distribution of ulnar nerve

Answer 19

fourth finger (medial portion)
fifth finger

Question 20

motor features of paralysis for ulnar nerve

Answer 20

loss of wrist ulnar deviation
weakened wrist and finger flexion
weakened fourth and fifth finger flexion
loss of thumb ADDuction
loss of most intrinsics (claw hand)

Question 21

spinal cord segments of sciatic nerve

Answer 21

L4-S3

Question 22

muscle innervations of sciatic nerve

Answer 22

hamstrings and adductor magnus

Question 23

sensory distribution of sciatic nerve

Answer 23

through its terminal branches of the tibial, superficial fibular, and deep fibular nerves

Question 24

motor features of paralysis

Answer 24

loss of knee flexion, weak hip adduction, and loss of all muscle function distal to the knee

Question 25

spinal cord segment of femoral nerve

Answer 25

L2-L4

Question 26

muscle innervations of femoral nerve

Answer 26

sartorius, quadriceps femoris, iliacus, pectineus

Question 27

sensory distribution of femoral nerve

Answer 27

middle anterior thigh, medial thigh proximal to knee

Question 28

motor features of paralysis for femoral nerve

Answer 28

loss of hip flexion, and knee extension

Question 29

spinal cord segment of tibial nerve

Answer 29

L4-S3

Question 30

muscle innervations of tibial nerve

Answer 30

gastrocnemius, soleus, plantaris, popliteus, tibialis posterior

Question 31

sensory distribution of tibial nerve

Answer 31

posterior/lateral calf, ankle and heel

Question 32

motor features of paralysis for tibial nerve

Answer 32

loss of plantarflexion, and knee flexion

Question 33

spinal cord segment of superficial fibular nerve

Answer 33

L5-S2

Question 34

muscle innervation of superficial fibular nerve

Answer 34

fibularis longus and brevis

Question 35

sensory distribution of superficial fibular nerve

Answer 35

anterior/lateral leg and ankle and most of the dorsum of the foot

Question 36

motor features of paralysis for superficial fibular nerve

Answer 36

loss of eversion

Question 37

spinal cord segment for deep fibular nerve

Answer 37

L4-L5

Question 38

muscle innervations for deep fibular nerve

Answer 38

``` tibialis anterior extensor hallucis longus extensor digitorum longus fibularis tertius extensor digitorum brevis extensor hallucis brevis ```

Question 39

sensory distribution of deep fibular nerve

Answer 39

web space between the first and second toes on the dorsum of the foot

Question 40

motor features of paralysis of deep fibular nerve

Answer 40

loss of dorsiflexion (drop foot) | weakness in the dorsal foot intrinsics