Dermatomes and Myotomes

Question 1

Myotome

Deltoid

Answer 1

C5

Shoulder flexion and abduction

Question 2

Myotome

Elbow flexion

Answer 2

C5, C6

Biceps Brachii

Shared with wrist extensors (ECRL, ECRB)

Question 3

Myotome

Elbow extension

Answer 3

C7

Triceps Brachii

Shared with wrist flexors (FCU: Flexor carpi ulnaris, FCR: Flexor carpi radialis)

Question 4

Myotome

FCU

Answer 4

C8

Ulnar deviation

Shared with Extensor carpi ulnaris (ECU)

Question 5

Myotome

Interossei

Answer 5

C8

Digit abduction and adduction

Question 6

Myotome

Hip flexion

Answer 6

L2, L3

Iliopsoas

Question 7

Myotome

Quadriceps

Answer 7

L2, L3, L4

Knee extension

Question 8

Myotome

L4

Answer 8

Ankle dorsiflexion

Tibialis anterior

Question 9

Myotome

S1

Answer 9

Plantarflexion, Eversion

Gastrocnemius; Peroneus longus, Peroneus brevis

Question 10

Myotome

L5

Answer 10

Great toe extension

Extensor Hallucis Longus (EHL)

Question 11

Dermatome

C2

Answer 11

Occipital protuberance

Question 12

Dermatome

C3

Answer 12

Supraclavicular fossa

Question 13

Dermatome

C4

Answer 13

Acromioclavicular joint

Question 14

Dermatome

C5

Answer 14

Lateral epicondyle

Question 15

Dermatome

C6

Answer 15

Thumb

Question 16

Dermatome

C7

Answer 16

Middle finger

Question 17

Dermatome

C8

Answer 17

Little finger

Question 18

Dermatome

T1

Answer 18

Medial epicondyle

Question 19

Dermatome

T2

Answer 19

Apex of the axilla

Question 20

Dermatome

T3

Answer 20

Midway between the apex of the axilla and the nipple line

Question 21

Dermatome

T4

Answer 21

Nipple line

Question 22

Dermatome

T5

Answer 22

Midway between T4 and T6

Question 23

Dermatome

T6

Answer 23

Xiphoid process

Question 24

Dermatome

T7

Answer 24

Midway between T6 and T8

Question 25

Dermatome

T8

Answer 25

Midway between T6 and T10

Question 26

Dermatome

T9

Answer 26

Midway between T8 and T10

Question 27

Dermatome

T10

Answer 27

Umbilicus

Question 28

Dermatome

T11

Answer 28

Midway between T10 and T12

Question 29

Dermatome

T12

Answer 29

Inguinal ligament

Question 30

Dermatome

L1`

Answer 30

Midway between T12 and L2

Question 31

Dermatome

L2

Answer 31

Antero-medial thigh

Question 32

Dermatome

L3

Answer 32

Medial femoral condyle

Question 33

Dermatome

L4

Answer 33

Medial malleolus

Question 34

Dermatome

L5

Answer 34

Dorsum of the foot

Question 35

Dermatome

S1

Answer 35

Lateral malleolus

Question 36

Dermatome

S2

Answer 36

Medial femoral condyle, popliteal fossa, back of the thigh

Question 37

Dermatome

S3

Answer 37

Ischial tuberosity

Question 38

Dermatome

S4-S5

Answer 38

Peri-anal area