Dermatomes & Myotomes

Question 1

Dermatome

Answer 1

area of skin innervated by the nerve fibers of a single spinal nerve –>sensory

Question 2

Mytome

Answer 2

Group of muscles that a single spinal nerve innervates –>motor

Question 3

Shoulder (Dermatome)

Answer 3

C5

Question 4

Thumb (Derm)

Answer 4

C6

Question 5

Middle finger (D)

Answer 5

C7

Question 6

Little finger (D)

Answer 6

C8

Question 7

Nipple (Derm)

Answer 7

T4

Question 8

Umbilicus (D)

Answer 8

T10

Question 9

Groin (D)

Answer 9

L1

Question 10

Medial foot (D)

Answer 10

L5

Question 11

Lateral leg/foot (Derm)

Answer 11

S1

Question 12

Anal area (D)

Answer 12

S2,3, 4

Question 13

C-5 (mytome)

Answer 13

Upper extremity abductors

deltoid, biceps brachii

Question 14

C-5/6 (Mytome)

Answer 14

Forearm flexors (biceps brachii, brachioradialis)
forearm pronators

Question 15

C-7 (M)

Answer 15

Forearm extensor (triceps brachii)
Wrist extensors
Finger extensors

Question 16

C-8/T1 (myotome)

Answer 16

Intrinsic hand muscles

Question 17

L-2 (myotome)

Answer 17

Thigh flexion (iliopsoas)

Question 18

L-3/4 (M)

Answer 18

Leg extension (quadriceps) (knee jerk reflex)

Question 19

L-4/5 (M)

Answer 19

Foot dorsiflexors

toe extensors

Question 20

S-1/2 (M)

Answer 20

Foot plantar flexors 
Toe flexors (achilles tendon reflex)

Question 21

S-2,3,4 (M)

Answer 21

Anal contraction