Dermatomes

Question 1

L1, L2, L3, L4

Answer 1

Anterior & inner surface of lower limbs

Question 2

L4, L5, S1

Answer 2

Foot

Question 3

L4

Answer 3

Medial side of great toe

Question 4

S1, S2, L5

Answer 4

Posterior and outer surface of lower limbs

Question 5

S1

Answer 5

Lateral margin of foot and little toe

Question 6

S2, S3, S4

Answer 6

Perineum

Question 7

T10

Answer 7

Umbilicus

Question 8

T12

Answer 8

Inguinal or groin regions

Question 9

C5

Answer 9

Clavicles

Question 10

C5, C6, C7

Answer 10

Lateral parts of upper limbs

Question 11

C8, T1

Answer 11

Medial sides of the upper limbs

Question 12

C6

Answer 12

Thumb

Question 13

C6, C7, C8

Answer 13

Hand

Question 14

C8

Answer 14

Ring, little fingers

Question 15

T4

Answer 15

Nipples

Question 16

Sensory Innervation of the face

Answer 16

• Cranial Nerve V (Trigeminal)

Question 17

V1 nerve

Answer 17

Opthalmic Nerve
* sensory to nose, paranasal sinuses, upper face, eyelids

Question 18

V2 Nerve

Answer 18

Maxillary Nerve
* sensory to middle 1/3 of face & upper teeth
* sensory input for lower eyelids, cheeks, nostrils, upper lip

Question 19

V3 nerve

Answer 19

Mandibular nerve
* lower jaw, lower teeth, lower lip, part of the tongue.

Question 20

Surgery: Peri-anal/anal surgery
“saddle block”

Answer 20

Dermatomes: S2-S5

Question 21

Surgery: Foot/Ankle

Answer 21

Dermatomes: L2

Question 22

Surgery: Thigh/lower leg/knee

Answer 22

Dermatome: L1

Question 23

Surgery: Vaginal Delivery/uterine/hip procedure/tourniquet/TURP

Answer 23

Dermatome: T10

Question 24

Surgery: Scrotum

Answer 24

Dermatome: S3

Question 25

Surgery: Penis

Answer 25

Dermatome: S2

Question 26

Surgery: Testicular Procedure

Answer 26

Dermatome: T8

Question 27

Surgery: Urologic/GYN/lower abdominal

Answer 27

Dermatome: T6

Question 28

Surgery: Cesarean section/upper abdominal

Answer 28

Dermatome: T4