Dermatomes and Myotomes

Question 1

C6 dermatome

Answer 1

Thumb

Question 2

C7 dermatome

Answer 2

Middle finger

Question 3

C8 dermatome

Answer 3

Pinky (ring and little finger)

Question 4

T4 dermatome

Answer 4

Nipple level

Question 5

T10 dermatome

Answer 5

Umbilicus level

Question 6

L4 dermatome

Answer 6

Big toe

Question 7

S1 dermatome

Answer 7

Lateral heel

Question 8

Where can you pick up clear dermatomal losses

Answer 8

Extreme ends/frontiers/autonomous zones. Axial lines/border between non-adjacent dermatomes

Question 9

Testing biceps reflex involves which spinal nerves?

Answer 9

C5 and C6

Question 10

Testing brachioradialis reflex involves which spinal nerve?

Answer 10

C6

Question 11

Testing triceps reflex involves which spinal nerve?

Answer 11

C7

Question 12

Testing patellar reflex involves which spinal nerve?

Answer 12

L4

Question 13

Testing Achilles reflex involves which spinal nerve?

Answer 13

S1

Question 14

C5 is a heavier innervator of abductors? T/F

Answer 14

True

Question 15

C6 is a heavier innervator of flexors? T?F

Answer 15

True

Question 16

What movement/s to test C5?

Answer 16

Dominant movement: Shoulder abduction (note C6 also involved but C5 dominates) and shoulder flexion

Question 17

What movement/s to test C6?

Answer 17

Shoulder abduction/flexion
Elbow flexion
Wrist flexion/extension

Question 18

What movement/s to test C7?

Answer 18

Dominant movement: Elbow extension and also wrist flexion

Question 19

What single movement to both test C6 and C7?

Answer 19

Dominant movement: Wrist extension

Question 20

What movement/s to test C8?

Answer 20

Dominant movement: Thumb opposition and reposition + finger flexion

Question 21

What movement/s to test T1?

Answer 21

Dominant movement: Abduction and Adduction of fingers

Question 22

What movement/s to test L2?

Answer 22

Dominant movement: Hip flexion

Question 23

What movement/s to test L3 and L4?

Answer 23

Dominant movement: Knee extension

Question 24

What movement/s to test L5 and S1?

Answer 24

Dominant movement: Knee flexion

Question 25

What movement/s to test L4?

Answer 25

Dominant movement: Ankle dorsiflexion

Question 26

What movement/s to test S1?

Answer 26

Dominant movement: Ankle plantarflexion, hip extension and knee flexion

Question 27

Which dermatome for thumb

Answer 27

C6

Question 28

Which dermatome for middle finger

Answer 28

C7

Question 29

Which dermatome for 5th finger

Answer 29

C8

Question 30

Which dermatome for nipple level

Answer 30

T4

Question 31

Which dermatome for umbilicus level

Answer 31

T10

Question 32

Which dermatome for big toe

Answer 32

L4

Question 33

Which dermatome for lateral heel

Answer 33

S1