Myotomes & Dermatomes

Question 1

What nerve root supplies sensation to the collar region?

Answer 1

C3-4

Question 2

What nerve root supplies sensation to the lateral forearm?

Answer 2

C6-7

Question 3

What nerve root supplies sensation to the medial arm?

Answer 3

T1

Question 4

What nerve root supplies sensation to the thumb?

Answer 4

C6

Question 5

What nerve root supplies sensation to the middle finger?

Answer 5

C7

Question 6

What nerve root supplies sensation to the little finger?

Answer 6

C8

Question 7

What nerve root supplies sensation to the nipple region?

Answer 7

T4

Question 8

What nerve root supplies sensation to the umbilicus?

Answer 8

T10

Question 9

What nerve root supplies sensation to the inguinal ligament?

Answer 9

L1

Question 10

What nerve root supplies sensation to the anterior and inner leg?

Answer 10

L2-3

Question 11

What nerve root supplies sensation to the medial side of the great toe?

Answer 11

L5

Question 12

What nerve root supplies sensation to the posterior and outer leg?

Answer 12

L5, S1-2

Question 13

What nerve root supplies sensation to the lateral foot and little toe?

Answer 13

S1

Question 14

What nerve root supplies sensation to the perineum?

Answer 14

S2-4

Question 15

From which nerve does sensation to the face originate?

Answer 15

The trigeminal nerve (CN5)

Question 16

What are the three branches of the trigeminal nerve (V1-3)?

Answer 16

Ophthalmic
Maxillary
Mandibular

Question 17

Which specific nerve supplies the dorsum of the ‘lateral half’ of the hand?

i.e., the dorsum of the the thumb, index, middle and half of the ring finger (not including the ‘tips’)

Answer 17

The radial nerve [superficial branch]

Question 18

Which specific nerve supplies the ‘medial half’ of the hand?

i.e., the dorsal and ventral aspect of the little finger and medial half of the ring finger (not including the tip of the ring finger)

Answer 18

The ulnar nerve

Question 19

Which specific nerve supplies the the ventral aspect of the ‘lateral half’ of the hand?

i.e., the palmar surface of the the thumb, index, middle and half of the ring finger including the ‘tips’

Answer 19

The median nerve

Question 20

Which specific nerve innervates the 1st web space of the foot?

Answer 20

The deep peroneal nerve

Question 21

Which specific nerve innervates the majority of the of the ventral aspect of the foot?

Answer 21

The superficial peroneal nerve

Question 22

Which specific nerve innervates the sole of the heel of the foot?

Answer 22

The calcaneal branch of the tibial nerve

Question 23

Which specific nerve innervates anterior half of the sole of the foot from medial half of the 4th toe, medially?

Answer 23

The medial plantar nerve

Question 24

Which specific nerve innervates anterior half of the sole of the foot from lateral half of the 4th toe, laterally?

Answer 24

The lateral plantar nerve

Question 25

Which specific nerve would sense pain over the base of the 5th metatarsal?

Answer 25

The sural nerve

Question 26

Which specific nerve supplies sensation to most of the lateral aspect of the forearm (dorsal and ventral)?

Answer 26

The musculocutaneous nerve

Question 27

What movement would a lesion at C5 disrupt?

Answer 27

Shoulder abduction

Question 28

What movement would a lesion at C6 disrupt?

Answer 28

Elbow flexion

Question 29

What movement would a lesion at C7 disrupt?

Answer 29

Elbow extension

Question 30

What movement would a lesion at C8 disrupt?

Answer 30

Finger flexion (i.e., grip strength)

Question 31

What movement would a lesion at T1 disrupt?

Answer 31

Finger abduction

Question 32

What movement would a lesion at L2 disrupt?

Answer 32

Hip flexion

Question 33

What movement would a lesion at L3 disrupt?

Answer 33

Knee extension

Question 34

What movement would a lesion at L4 disrupt?

Answer 34

Dorsiflexion

Question 35

What movement would a lesion at L5 disrupt?

Answer 35

Great toe extension

Question 36

What movement would a lesion at S1 disrupt?

Answer 36

Plantarflexion