Dermatomes/Myotomes

Question 1

C-5 muscle innervation

Answer 1

Upper extremity abductors (deltoid, biceps brachii)

Question 2

C-5/6 muscle innervation

Answer 2

Forearm flexors (biceps brachii, brachioradialis), forearm pronators

Question 3

C-7 muscle innervation

Answer 3

forearm extensor (triceps brachii), wrist extensors, finger extensors

Question 4

C-8/T1 muscle innervation

Answer 4

Intrinsic hand muscles

Question 5

L-2 muscle innervation

Answer 5

Thigh flexion (iliopsoas)

Question 6

L-3/4 muscle innervation

Answer 6

leg extension (quadriceps); knee jerk reflex

Question 7

L-4/5 muscle innervation

Answer 7

Foot dorsiflexors and toe extensors (anterior tibial muscles)

Question 8

S-1/2 muscle innervation

Answer 8

foot plantar flexors and toe flexors (posterior tibial muscles)(Achilles tendon reflex)

Question 9

S-2,3,4 muscle innervation

Answer 9

Anal contraction (sphincter)

Question 10

Dermatome def.

Answer 10

unilateral area of skin innervated by nerve fibers of a single spinal nerve; segments of spinal cord sensory to specific body areas

Question 11

Myotome def.

Answer 11

spinal nerves innervating groups of muscles

Question 12

Dermatome C5

Answer 12

shoulder

Question 13

Dermatome C6

Answer 13

thumb

Question 14

Dermatome C7

Answer 14

middle finger

Question 15

Dermatome C8

Answer 15

little finger

Question 16

Dermatome T4

Answer 16

nipple

Question 17

Dermatome T10

Answer 17

Umbilicus

Question 18

Dermatome L5

Answer 18

Medial foot

Question 19

Dermatome S1

Answer 19

Lateral leg/foot

Question 20

Dermatome S 2,3,4

Answer 20

anal area