Simple Dermatomes

Question 1

Which region is innervated by C4?

Answer 1

Clavicle

Question 2

Which region is innervated by C5?

Answer 2

Lateral upper arm

Question 3

Which region is innervated by C6?

Answer 3

Lateral forearm, thumb and palmar index finger

Question 4

Which region is innervated by C7?

Answer 4

Middle finger, dorsal index finger and associated palm areas

Question 5

Which region is innervated by C8?

Answer 5

Palm and dorsum of ring and little finger and associated Palm areas

Question 6

Which region is innervated by T1?

Answer 6

Medial forearm

Question 7

Which region is innervated by T2?

Answer 7

Medial upper arm

Question 8

Which region is innervated by T4?

Answer 8

Nipple

Question 9

Which region is innervated by T10?

Answer 9

Umbilicus (Navel)

Question 10

Which region is innervated by T12-L1?

Answer 10

Inguinal/groin region

Question 11

Which region is innervated by L2?

Answer 11

Lateral and anterior thigh

Question 12

Which region is innervated by L3?

Answer 12

Medial thigh and anterior knee

Question 13

Which region is innervated by L4?

Answer 13

Medial leg

Question 14

Which region is innervated by L5?

Answer 14

Lateral leg and medial foot

Question 15

Which region is innervated by S1?

Answer 15

Lateral foot (including digits 4 and 5) and heel and Achilles’ tendon

Question 16

Which region is innervated by S3?

Answer 16

Outer buttock

Question 17

Which region is innervated by S4?

Answer 17

Inner buttock

Question 18

Which region is innervated by S5?

Answer 18

Ring around anus

Question 19

Which region is innervated by S2?

Answer 19

Posterior thigh, popliteal fossa and central triangle moving halfway down leg