Myotomes & Dermatomes

Question 1

what is myotome

Answer 1

A group of muscles innervated by a single spinal nerve

Question 2

C4 myotome

Answer 2

shoulder shrugs

Question 3

C5 myotome

Answer 3

shoulder abduction and external rotation; elbow flexion

Question 4

C6 myotome

Answer 4

wrist extension

Question 5

C7 myotome

Answer 5

elbow extension and wrist flexion

Question 6

C8 myotome

Answer 6

thumb extension and finger flexion

Question 7

T1 myotome

Answer 7

finger abduction

Question 8

L2 myotome

Answer 8

hip flexion

Question 9

L3 myotome

Answer 9

knee extension

Question 10

L4 myotome

Answer 10

ankle dorsiflexion

Question 11

L5 myotome

Answer 11

great toe extension

Question 12

S1 myotome

Answer 12

ankle plantarflexion

Question 13

S4 myotome

Answer 13

bladder and rectum motor supply

Question 14

how do you test nerve irritation

Answer 14

straight leg test, see if they complain of pain shooting up leg

Question 15

what is a dermatome

Answer 15

an area of skin supplied by a single spinal nerve

Question 16

cranial nerve 5 (trigeminal) dermatome (remember these are head!!)

Answer 16

V1 - opthalmic branch - top of head V2 - maxillary branch - nares to top lip V3 - mandibular branch - bottom lip to jaw

Question 17

C2 dermatome

Answer 17

occipital protuberance

Question 18

C3 dermatome

Answer 18

supraclavicular fossa

Question 19

C4 dermatome

Answer 19

acromioclavicular joint

Question 20

C5 dermatome

Answer 20

lateral antecubital fossa

Question 21

C6 dermatome

Answer 21

thumb

Question 22

C7 dermatome

Answer 22

middle finger

Question 23

C8 dermatome

Answer 23

little finger

Question 24

T1 dermatome

Answer 24

medial antecubital fossa

Question 25

T2 dermatome

Answer 25

apex of axilla

Question 26

T3-T12 dermatome

Answer 26

bands down torso

Question 27

L1 dermatome

Answer 27

upper anterior thigh

Question 28

L2 dermatome

Answer 28

mid anterior thigh

Question 29

L3 dermatome

Answer 29

medial femoral condyle

Question 30

L4 dermatome

Answer 30

medial malleolus

Question 31

L5 dermatome

Answer 31

dorsum of 3rd metatarsal phalangeal joint

Question 32

S1 dermatome

Answer 32

lateral heel

Question 33

S2 dermatome

Answer 33

popliteal fossa

Question 34

S3 dermatome

Answer 34

ischial tuberosity

Question 35

S4-5 dermatome

Answer 35

perianal area

Question 36

what is dermatome diagram

Answer 36