Dermatomes/Myotomes/Reflexes

Question 1

Dermatome: C2

Answer 1

Temple
Forehead
Occiput

Question 2

Dermatome: C3

Answer 2

Neck
Cheek
Temporal
Under mandible

Question 3

Dermatome: C4

Answer 3

Shoulder
Clavicle
Upper scapula

Question 4

Dermatome: C5

Answer 4

Deltoid
Anterior arm to base of thumb

Question 5

Dermatome: C6

Answer 5

Anterior arm
Radial side of hand (thumb + index)

Question 6

Dermatome: C7

Answer 6

Lateral arm & forearm
Digits 2-4

Question 7

Dermatome: C8

Answer 7

Medial arm & forearm
Digits 3-5

Question 8

Dermatome: T1

Answer 8

Medial forearm
Base of 5th digit

Question 9

Dermatome: T2

Answer 9

Medial upper arm
Medial elbow
Pecs
Midscapular

Question 10

Dermatome: T3-6

Answer 10

Upper thorax

Question 11

Dermatome: T5-7

Answer 11

Costal margin

Question 12

Dermatome: T8-12

Answer 12

Abdomen
Lumbar

Question 13

Dermatome: L1

Answer 13

Back
Greater trochanter
Groin

Question 14

Dermatome: L2

Answer 14

Back
Front of thigh to knee

Question 15

Dermatome: L3

Answer 15

Back
Upper buttock
Anterior thigh
Medial lower leg

Question 16

Dermatome: L4

Answer 16

Medial buttock
Lateral thigh
Medial lower leg
Dorsum of foot
Big toe

Question 17

Dermatome: L5

Answer 17

Buttock
Posterior/lateral thigh
Lateral lower leg
Dorsum of foot
Medial half of sole (digits 1-3)

Question 18

Dermatome: S1-2

Answer 18

Buttock
Posterior thigh
Posterior lower leg

Question 19

Dermatome: S3

Answer 19

Groin
Medial thigh to knee

Question 20

Dermatome: S4

Answer 20

Perineum
Genitals
Lower sacrum

Question 21

Myotome: C5

Answer 21

Shoulder abduction

Question 22

Myotome: C6

Answer 22

Elbow flexion
Wrist extension

Question 23

Myotome: C7

Answer 23

Elbow extension

Question 24

Myotome: C8

Answer 24

Thumb extension
Ulnar deviation

Question 25

Myotome: T1

Answer 25

Finger abduction

Question 26

Myotome: L2

Answer 26

Hip flexion

Question 27

Myotome: L3

Answer 27

Knee extension

Question 28

Myotome: L4

Answer 28

Ankle DF

Question 29

Myotome: L5

Answer 29

Big toe extension

Question 30

Myotome: S1

Answer 30

Ankle PF

Question 31

Myotome: S2

Answer 31

Knee flexion

Question 32

Are DTRs increased or decreased with LMN lesions?

Answer 32

Decreased
Typically 1+

Question 33

Are DTRs increased or decreased with UMN lesions?

Answer 33

Increased
Typically 3+

Question 34

DTR for C5-6

Answer 34

Biceps

Question 35

DTR for C6

Answer 35

Brachialis

Question 36

DTR for C7

Answer 36

Triceps

Question 37

DTR for C8

Answer 37

Distal finger flexors

Question 38

DTR for L4

Answer 38

Knee jerk

Question 39

DTR for S1

Answer 39

Achilles jerk

Question 40

Reflex Grading: 0

Answer 40

no contraction

Question 41

Reflex Grading: 1+

Answer 41

Hyporeflexic
Decreased but still present

Question 42

Reflex Grading: 2+

Answer 42

Normal

Question 43

Reflex Grading: 3+

Answer 43

Hyperreflexic

Question 44

Reflex Grading: 4+

Answer 44

Clonus
Repetitive shortening after single stimulation