Dermatomes and Myotomes

Question 1

C1 Dermatome

Answer 1

D: vertex of skull

Question 2

C2 Dermatome

Answer 2

D: temple, forehead, occiput (posterior head)

Question 3

C3 Dermatome

Answer 3

D: neck, posterior cheek, temporal area, prolongation forward under mandible (posteriolateral neck)

Question 4

C4 Dermatome

Answer 4

D: shoulder area, clavicle, upper scapula (Acromioclavicular joint)

Question 5

C5 Dermatome

Answer 5

D: deltoid area, anterior aspect of arm to base of thumb (Lateral Arm)

Question 6

C6 Dermatome

Answer 6

D: anterior arm, radial side of hand to thumb, index finger (Lateral forearm and thumb)

Question 7

C7 Dermatome

Answer 7

D: lateral arm/forearm to middle, ring, and pinkie fingers (palmar distal phalanx-middle finger)

Question 8

C8 Dermatome

Answer 8

D: medial arm/forearm to middle, ring and pinkie fingers (little finger and ulnar border of hand)

Question 9

T1 Dermatome

Answer 9

D: Medial side of forearm to base of pinkie finger (medial forearm

Question 10

T2 Dermatome

Answer 10

D: medial side of upper arm to medial elbow, pectoral and midscapular areas

Question 11

T3-6 Dermatome

Answer 11

D: upper thorax

Question 12

T5-7 Dermatome

Answer 12

D: costal margin

Question 13

T8-12 Dermatome

Answer 13

D:abdomen and lumbar region

Question 14

L1 Dermatome

Answer 14

D: Back, over greater trochanter and groin

Question 15

L2 Dermatome

Answer 15

D: Back, front of thigh to knee (anterior thigh)

Question 16

L3 Dermatome

Answer 16

D: Back, upper buttock, anterior thigh and knee, medial lower leg (middle 1/3 of anterior thigh)

Question 17

L4 Dermatome

Answer 17

D: Medial buttock, lateral thigh, medial leg, dorsum of foot, big toe (patella and medial malleolus)

Question 18

L5 Dermatome

Answer 18

D: buttock, posterior/lateral thigh, lateral aspect of leg, dorsum of foot, medial half of sole, 1st, 2nd, and 3rd toes (Fibular head and dorsum of foot)

Question 19

S1 Dermatome

Answer 19

D: Lateral and plantar aspect of foot

Question 20

S2 Dermatome

Answer 20

D: buttock, thigh, posterior leg (medial aspect of posterior thigh)

Question 21

S3 Dermatome

Answer 21

D: groin, medial thigh-knee (perianal area)

Question 22

S4 Dermatome

Answer 22

D: perineum, genitals, lower sacrum (perianal area)

Question 23

C1 Myotome

Answer 23

M: n/a

Resistive Test: cervical rotation

Question 24

C2 Myotome

Answer 24

M: longus colli, sternocleidomastoid, rectus capitis

Resistive Test: shoulder elevation

Question 25

C3 Myotome

Answer 25

M: trapezius, splenius capitis, Diaphragm, Scalenes | Resistive Test: shoulder elevation

Question 26

C4 Myotome

Answer 26

M: trapezius, levator scapulae, Diaphragm, Scalenes | Resistive Test: shoulder elevation

Question 27

C5 Myotome

Answer 27

M: supraspinatus, infraspinatus, deltoid, biceps, Diaphragm, Scalenes Resistive Test: shoulder ABduct, elbow flexion

Question 28

C6 Myotome

Answer 28

M: biceps, supinator, wrist extensors, Scalenes | Resistive Test: elbow flexion, wrist extension

Question 29

C7 Myotome

Answer 29

M: triceps, wrist flexors, Scalenes | Resistive Test: elbow extension, wrist flexion

Question 30

C8 Myotome

Answer 30

M: ulnar deviators, thumb extensors/ADDuctors, Scalenes | Resistive Test: thumb extension

Question 31

T1 Myotome

Answer 31

M: palmaris longus, flexor carpi ulnaris, Pronator Quadratus | Resistive Test: finger ADDuction

Question 32

T5-7 Myotome

Answer 32

M: Rectus Abdominis, Interal/External Obliues, Transverse Abdonimis

Question 33

T8-12 Myotome

Answer 33

M: Quadratus Lumborum, Rectus Abdominis, Internal/External Obliues, Transverse Abdonimis

Question 34

L3 Myotome

Answer 34

M: Psoas, quadriceps, ADDuctors, Sartorius | Resistive Test: knee extension

Question 35

L4 Myotome

Answer 35

M: Hamstrings, glut medius, Tibialis anterior, extensors hallucis,TFL, IT band Resistive Test: knee extension, Ankle Dorsiflexion

Question 36

L5 Myotome

Answer 36

M: Hamstrings, glut max/medius, TFL, IT Band, Piriformis, Plantaris, Popliteus, peroneals, Tib Anterior/Posterior, Extensor/Flexor Digitorum, Ext/Flex hallucis Resistive Test: Ankle Dorsflexion, great toe extension

Question 37

S1 Myotome

Answer 37

M: calf, hamstrings, gluteals, peroneals, plantarflexors | Resistive Test: ankle plantarflexion

Question 38

S2 Myotome

Answer 38

M: calf, hamstrings, gluteals, plantarflexors

Question 39

S4 Myotome

Answer 39

M: bladder, rectum

Question 40

L2 Myotome

Answer 40

M: Psoas, hip ADDuctors, Sartorius | Resistive Test: hip flexion