Nerve Muscle Root Flashcards
Shoulder abduction
Deltoid muscle
Axillary nerve
C5/C6
Elbow flexion
Biceps - C5/C6, Musculocutanous nerve
Brachioradialis - C6, Radial nerve
Elbow Extension
Triceps, C7, Radial,
Wrist extension
Extensor carpi radialis longus, radial, C6
Extensor carpi ulnaris, PIN (radial), C7
Supination
Supinator, radial nerve, C6/7
Pronation
Pronator teres, median, C6/7
Wrist flexion
Flexor carpi radialis, median, C6/7
Flexor carpi ulnaris, ulnar, C7-T1
Finger abduction
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
Finger flexion
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
Finger extension
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
Hip flexion
Iliopsoas, femoral, L1, L2, L3
Hip extension
Gluteus Maximus, inferior gluteal, L5/S1
Knee Flexion
Hamstrings, sciatic, S1
Knee extension
Quadriceps, femoral, L2-4
Hip adduction
“Adductors” = adductor longus, adductor brevis, adductor magnus, gracilis, and pectineus
Obturator nerve
L2/L3
Hip Abduction
Gluteus medius/minimus & TFL
Superior gluteal nerve
L4, L5, S1
Ankle dorsiflexion
Tibialis anterior, Deep peroneal, L4/L5
Ankle plantar flexion
Gastrocs & Soleus, Tibial nerve (Sciatic), S1/S2
Ankle inversion
Tibialis posterior, tibial nerve, L4-L5
Toe extension
Extensor digitorum longus, deep peroneal nerve, L5/S1
Extensor hallucis longus, deep peroneal nerve, L5/S1
Ankle inversion
Peroneus longus & brevis, superficial peroneal nerve, L5/S1
Muscles Innervated by Radial Nerve
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
Muscles Innervated by Median Nerve
- 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)
Muscles Innervated by Ulnar Nerve
- 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
C6 vs Median
C6 = Deltoid (axillary), biceps (MC), extensor carpi radialis (radial)
Median = FDP (C8/T1), APB (C8/T1)
C7 vs Radial
C7 = Pronator terries (median)
Radial = Brachioradialis (C5/C6)
C8/T1 vs Ulnar
C8/T1 & Lower trunk = APB (median), FPL (median/AIN), Extensor indices (radial)
Medial Cord = Extensor indices spared
Ulnar =
Foot drop
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)
