Dermatomes

Question 1

1cm lateral to the occipital protuberance at the base of the skull
3cm behind the ear

Answer 1

C2

Question 2

supraclavicular fossa at midclavicular line

Answer 2

C3

Question 3

acromioclavicular joint

Answer 3

C4

Question 4

Lateral (Radial) side of antecubital fossa

Answer 4

C5

Question 5

At blood extraction area

Answer 5

C5

Question 6

dorsal surface of proximal phalanx of thumb

Answer 6

C6

Question 7

Dorsal surface of proximal phalanx of middle finger

Answer 7

C7

Question 8

Dorsal surface of proximal phalanx of little finger

Answer 8

C8

Question 9

Medial (ulnar) side of antecubital fossa;

proximally to the medial epicondyle of the humerus

Answer 9

T1

Question 10

Axilla

Answer 10

T2

Question 11

Third ICS

Answer 11

T3

Question 12

Fourth ICS, at the level of the nipples

Answer 12

T4

Question 13

Fifth ICS, between level of nipple and xiphoid process

Answer 13

T5

Question 14

Horizontal level of the xiphoid process

Answer 14

T6

Question 15

One quarter distance b/n level of xiphoid process and umbilicus

Answer 15

T7

Question 16

One half of the distance b/n level of xiphoid process and umbilicus

Answer 16

T8

Question 17

Three quarters of the distance b/n level of xiphoid process and umbilicus

Answer 17

T9

Question 18

Horizontal level of the umbilicus

Answer 18

T10

Question 19

Between the level of the umbilicus and inguinal ligament

Answer 19

T11

Question 20

Inguinal ligament

Answer 20

T12

Question 21

Key sensory points for T12 and L2

Answer 21

L1

Question 22

Anterior medial thigh;

midpoint of the inguinal ligament and medial to epicondyle of femur

Answer 22

L2

Question 23

Medial epicondyle of femur

Answer 23

L3

Question 24

Medial malleous

Answer 24

L4

Question 25

Dorsum of the foot; | third metatarsophalangeal joint

Answer 25

L5

Question 26

Lateral aspect of calcaneus

Answer 26

S1

Question 27

Popliteal fossa

Answer 27

S2

Question 28

Tuberosity of the ischium | infragluteal fold

Answer 28

S3

Question 29

Perineal area; less than 1cm lateral to mucocutaneous zone

Answer 29

S4-S5

Question 30

Neck muscles

Answer 30

C1-4

Question 31

Diaphragm

Answer 31

C3-5

Question 32

Deltoid | Biceps

Answer 32

C5,6

Question 33

Extensor carpi radialis

Answer 33

C6,7

Question 34

Triceps | extensor digitorum

Answer 34

C7,8

Question 35

Flexor digitorum profundus | hand intrinsics

Answer 35

C8, T1

Question 36

Intercostals

Answer 36

T2-9

Question 37

Upper abdominals

Answer 37

T9,10

Question 38

Lower abdominals

Answer 38

T11,12

Question 39

Iliopsoas

Answer 39

L2,3

Question 40

Quadriceps

Answer 40

L3,4

Question 41

Medial hamstrings posterior tibialis extensor hallucis longus

Answer 41

L5, S1

Question 42

Gastrocnemius

Answer 42

S1,2

Question 43

Flexor digitorum

Answer 43

S2,3

Question 44

Bladder | lower bowel anal sphincter

Answer 44

S2-4

Question 45

Inspiration

Answer 45

C3,4,5

Question 46

Abduct arm <90 degree | Elbow flexion

Answer 46

C5,6

Question 47

Wrist extension

Answer 47

C6,7

Question 48

Elbow extension | Finger extension

Answer 48

C7,8

Question 49

Grasp | Abduct little finger

Answer 49

C8,T1

Question 50

Beevor’s sign

Answer 50

T9,10 | T11,12

Question 51

Hip flexion | Cremasteric reflex

Answer 51

L2,3

Question 52

Knee extension | Knee jerk

Answer 52

L3,4

Question 53

Ankle dorsiflexion

Answer 53

L4,5

Question 54

Knee flexion Foot inversion Great toe extension

Answer 54

L5,S1

Question 55

Ankle plantarflexion | Ankle jerk

Answer 55

S1,2

Question 56

Clamp down during rectal exam

Answer 56

S2-4

Question 57

Sciatica | Herniated disc

Answer 57

Sacral and lumbar dermatome

Question 58

Lower back pain

Answer 58

Lumbar dermatome

Question 59

An area of the skin that is mainly supplied by a single spinal nerve (collection of axons in the PNS)

Answer 59

Dermatome