Myotomes and Dermatomes

Question 1

L1 dermatome region?

Answer 1

Groin

Question 2

L2 dermatome region?

Answer 2

Medial thigh

Question 3

L3 dermatome region?

Answer 3

Anteromedial thigh + superior-half of medial gastroc

Question 4

L4 dermatome region?

Answer 4

Anterior thigh + medial foot

Question 5

L5 dermatome region?

Answer 5

Lateral thigh + dorsal surface of foot + plantar surface of foot (middle 3 toes)

Question 6

S1 dermatome region?

Answer 6

Posterolateral thigh + lateral foot

Question 7

S2 dermatome region?

Answer 7

Posteromedial thigh

Question 8

L2 myotome?

Answer 8

Hip flexion

Question 9

S2 myotome?

Answer 9

Knee flexion

Question 10

L5 myotome?

Answer 10

Big toe extension

Question 11

L3 myotome?

Answer 11

Knee extension

Question 12

L4 myotome?

Answer 12

Foot dorsiflexion

Question 13

S1 myotome?

Answer 13

Foot plantarflexion, foot eversion, or big toe flexion

Question 14

L3/L4 deep tendon reflex?

Answer 14

Patellar tendon

Question 15

L5/S1 deep tendon reflex?

Answer 15

Achilles tendon

Question 16

C1/C2 myotome?

Answer 16

Neck flexion

Question 17

C3 myotome?

Answer 17

Neck lateral flexion

Question 18

C4 myotome?

Answer 18

Scapulae/Shoulder girdle elevation

Question 19

C5 myotome?

Answer 19

Arm/Shoulder joint abduction

Question 20

C6 myotome?

Answer 20

Elbow flexion or wrist extension

Question 21

C7 myotome?

Answer 21

Elbow extension or wrist flexion

Question 22

C8 myotome?

Answer 22

Thumb extension or ulnar deviation

Question 23

T1 myotome?

Answer 23

Finger intrinsics (abduction and/or adduction…?)

Question 24

C5/C6 deep tendon reflex?

Answer 24

Biceps or brachioradialis tendon

Question 25

C7/C8 deep tendon reflex?

Answer 25

Triceps tendon