Nerves, Muscles, & Dermatomes

Question 1

Wasting of Abductor Pollicis Brevis

Answer 1

Median nerve lesion (Carpal Tunnel)

Question 2

Deltoid muscle - nerve & nerve root(s)?

Answer 2

Axillary nerve

- C5 nerve root

Question 3

What does Pronator Drift test?

Answer 3

Upper motor neuron weakness… Supination is weaker than pronation in the upper extremity, leading to a pronation of the affected arm.

(also excellent for verification of internal consistency, because if a patient fakes the weakness, they almost always drop their arm without pronating it)

Question 4

Biceps muscle - nerve & nerve root(s)?

Answer 4

Musculocutaneous nerve

- C5 & C6

Question 5

Triceps muscle - nerve & nerve root(s)?

Answer 5

Radial nerve

- C6 & C7

Question 6

Wrist extensor muscle(s) - nerve & nerve root(s)?

Answer 6

Radial nerve

- C6 & C7

Question 7

Finger flexor muscle(s) - nerve & nerve root(s)?

Answer 7

Median nerve

- C8

Question 8

Finger abduction muscle(s) - nerve & nerve root(s)?

Answer 8

Ulnar nerve

- T1

Question 9

Thumb opposition muscle(s) - nerve & nerve root(s)?

Answer 9

Median nerve

- C8 & T1

Question 10

Hip flexion muscle(s) - nerve & nerve root(s)?

Answer 10

Femoral nerve

- L2 & L3

Question 11

Hip adduction - nerve roots?

Answer 11

L2, L3, L4

Question 12

Hip abduction - nerve roots?

Answer 12

L4, L5, S1

Question 13

Hip extension muscle(s) - nerve & nerve root(s)?

Answer 13

Gluteal nerve

- L4 & L5

Question 14

Quadriceps (knee ext) muscle(s) - nerve & nerve root(s)?

Answer 14

Femoral nerve

- L3 & L4

Question 15

Hamstrings (knee flexion) muscle(s) - nerve & nerve root(s)?

Answer 15

Sciatic nerve

- L5 & S1

Question 16

Ankle dorsiflexion muscle(s) - nerve & nerve root(s)?

Answer 16

Peroneal nerve

- L4 & L5

Question 17

Ankle plantar flexion muscle(s) - nerve & nerve root(s)?

Answer 17

Tibial nerve

- S1, S2

Question 18

Extensor Hallucis Longus - nerve root?

Answer 18

L5

Question 19

Posterior aspect of the shoulders

Answer 19

C4

Question 20

Lateral aspect of the upper arms

Answer 20

C5

Question 21

Medial aspect of lower arms - sensory level?

Answer 21

T1

Question 22

Tip of thumb - sensory level?

Answer 22

C6

Question 23

Tip of middle finger - sensory level?

Answer 23

C7

Question 24

Tip of pinky finger - sensory level?

Answer 24

C8

Question 25

Thorax, nipple level - sensory level?

Answer 25

T4 (or 5)

Question 26

Umbilical level - sensory level?

Answer 26

T10

Question 27

Upper lateral thigh, over kneecap, lower medial leg & medial foot - sensory level?

Answer 27

T4

Question 28

Medial thigh - sensory level?

Answer 28

• L2 upper half

- L3 lower half (until knee)

Question 29

Lower lateral thigh, lateral knee, anterior shin & anterior foot - sensory level?

Answer 29

L5

- also covers Dorsum of the foot

Question 30

Posterior thigh & leg - sensory level?

Answer 30

• S1, lateral half of posterior thigh/leg & lateral edge of foot
• S2, medial half of posterior thigh/leg/ankle

Question 31

Medial edge of foot?

Answer 31

L4

Question 32

Dorsum of foot?

Answer 32

L5

Question 33

Biceps reflex - nerve root(s)?

Answer 33

C5 & C6

Question 34

Brachioradialis reflex - nerve root(s)?

Answer 34

C5 & C6

Question 35

Triceps reflex - nerve root(s)?

Answer 35

C6 & C7

mostly C7

Question 36

Knee jerk reflex - nerve root(s)?

Answer 36

L3 & L4

mostly L4

Question 37

Ankle jerk reflex - nerve root(s)?

Answer 37

S1