Nerve Muscle Root

Question 1

Shoulder abduction

Answer 1

Deltoid muscle
Axillary nerve
C5/C6

Question 2

Elbow flexion

Answer 2

Biceps - C5/C6, Musculocutanous nerve

Brachioradialis - C6, Radial nerve

Question 3

Elbow Extension

Answer 3

Triceps, C7, Radial,

Question 4

Wrist extension

Answer 4

Extensor carpi radialis longus, radial, C6

Extensor carpi ulnaris, PIN (radial), C7

Question 5

Supination

Answer 5

Supinator, radial nerve, C6/7

Question 6

Pronation

Answer 6

Pronator teres, median, C6/7

Question 7

Wrist flexion

Answer 7

Flexor carpi radialis, median, C6/7

Flexor carpi ulnaris, ulnar, C7-T1

Question 8

Finger abduction

Answer 8

THUMB
Abductor pollicis longus, PIN (radial), C7
Abductor pollicis brevis, median, C8/T1

D2
FDI, Ulnar, C8/T1

PINKY
Abductor digiti minimi, ulnar, C8-T1

Question 9

Finger flexion

Answer 9

Flexor digitorum superficialis, median, C7-T1
Flexor digitorum profundus 1&2, AIN (median), C7/8

Flexor pollicis longus, AIN (median), C7/8

Flexor digiti minimi, ulnar, C8/T1

Question 10

Finger extension

Answer 10

D1 =

• extensor pollicis longus, PIN (radial), C7 ***tested at carbo-metacarpal joint
• extensor pollicis brevis, PIN (radial), C7 ***tested at metacarpophalangeal joint

D2-5 = Extensor digitorum, PIN (radial), C7

Question 11

Hip flexion

Answer 11

Iliopsoas, femoral, L1, L2, L3

Question 12

Hip extension

Answer 12

Gluteus Maximus, inferior gluteal, L5/S1

Question 13

Knee Flexion

Answer 13

Hamstrings, sciatic, S1

Question 14

Knee extension

Answer 14

Quadriceps, femoral, L2-4

Question 15

Hip adduction

Answer 15

“Adductors” = adductor longus, adductor brevis, adductor magnus, gracilis, and pectineus
Obturator nerve
L2/L3

Question 16

Hip Abduction

Answer 16

Gluteus medius/minimus & TFL
Superior gluteal nerve
L4, L5, S1

Question 17

Ankle dorsiflexion

Answer 17

Tibialis anterior, Deep peroneal, L4/L5

Question 18

Ankle plantar flexion

Answer 18

Gastrocs & Soleus, Tibial nerve (Sciatic), S1/S2

Question 19

Ankle inversion

Answer 19

Tibialis posterior, tibial nerve, L4-L5

Question 20

Toe extension

Answer 20

Extensor digitorum longus, deep peroneal nerve, L5/S1

Extensor hallucis longus, deep peroneal nerve, L5/S1

Question 21

Ankle inversion

Answer 21

Peroneus longus & brevis, superficial peroneal nerve, L5/S1

Question 22

Muscles Innervated by Radial Nerve

Answer 22

At axilla
- Triceps, Bracioradilais

At spiral groove
- Extensor carpi radialis longus

PIN:

• Supinator
• Extensor carpi ulnaris
• Extensor digitorum
• Abductor policis longus
• Extensor pollicis longus
• Extensor pollicis brevis
• Extensor indices

Question 23

Muscles Innervated by Median Nerve

Answer 23

• Pronator terres
• Flexor carpi radialis
• Flexor digitorum superficialis
• LOAF (Lumbricles I & II, Opponens pollicis, Abductor pollicis brevis (APB), Flexor pollicis brevis)

AIN

• Pronator quadratus
• Flexor digitorum profundus I & II
• Flexor pollicis longus (FPL)

Question 24

Muscles Innervated by Ulnar Nerve

Answer 24

• Flexor carpi ulnaris
• Flexor digitorum profundus III & IV
• Hypothenar muscles
• Adductor pollicis
• Flexor pollicis brevis
• Palmar interossei
• Dorsal interossei
• Lumbricles III & IV

Ulnar at elbow vs (hypothenar sensory changes)
Ulnar at wrist (4th and 5th finger sensory changes) ***to differentiate elbow vs wrist, you’re looking for conduction block on EMG/NCS

Question 25

C6 vs Median

Answer 25

C6 = Deltoid (axillary), biceps (MC), extensor carpi radialis (radial)

Median = FDP (C8/T1), APB (C8/T1)

Question 26

C7 vs Radial

Answer 26

C7 = Pronator terries (median)

Radial = Brachioradialis (C5/C6)

Question 27

C8/T1 vs Ulnar

Answer 27

C8/T1 & Lower trunk = APB (median), FPL (median/AIN), Extensor indices (radial)

Medial Cord = Extensor indices spared

Ulnar =

Question 28

Foot drop

Answer 28

L5 = Hip abduction

Sciatic = Knee flexion, Inversion

Peroneal
- Common = Dorsiflexion, Eversion

• Deep = Dorsiflexion (eversion is superficial peroneal)

****You can differentiate sciatic vs peroneal on EMG with the short head of the biceps femoris (sciatic, not peroneal)