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12.10.17 Nerves, Roots, Muscles

Motor Neuro Exam - Muscles and Nerves


Shoulder Abduction
C5
Deltoid
Axillary
  Adduction
C5-C7
Pectoralis major
Pectoral
Elbow
Flexion
C5-C6
Biceps
Brachialis
Musculocutaneous
  Extension
C7
Triceps
Radial
Wrist
Flexion
C7-C8
Flexor carpi radialis
Flexor carpi ulnaris
Median
Ulnar
  Extension
C6-C7
Extensor carpi radialis Radial
Fingers
Flexion
C8
Flexor digitorum profundus Median
  Extension
C7
Extensor digitorum
Extensor indicis
Extensor digiti minimi
Radial
  Abduction
T1
Dorsal interossei
Abductor digiti minimi
Ulnar
Thumb
Abduction
C8-T1
Abductor pollicis brevis
Median
Hip
Flexion
L1-L2
Iliopsoas Femoral
  Adduction
L2-L3
Obturator externus
Adductor longus, magnus, brevis
Gracilis
Obturator
  Extension
L5-S1
Gluteus maximus Gluteal
Knee
Flexion
L5-S1
Semitendinosus
Semimembranosus
Biceps femoris
Sciatic
  Extension
L3-L4
Quadriceps
Femoral
Ankle
Dorsiflexion
L4
Tibialis anterior Deep peroneal
  Eversion
L5-S1
Peroneus longus
Peroneus brevis
Superficial peroneal
  Plantarflexion
S1-S2
Gastrocnemius
Soleus
Tibial
Big Toe
Extension
L5
Extensor hallucis longus Deep peroneal



Nerve Roots

Level Function
C1-C6 Neck flexors
C1-T1 Neck extensors
C3, C4, C5 Supply diaphragm (mostly C4)
C5, C6 Shoulder movement, raise arm (deltoid); flexion of elbow (biceps); C6 externally rotates the arm (supinates)
C6, C7 Extends elbow and wrist (triceps and wrist extensors); pronates wrist
C7, T1 Flexes wrist
C7, T1 Supply small muscles of the hand
T1 -T6 Intercostals and trunk above the waist
T7-L1 Abdominal muscles
L1, L2, L3, L4 Thigh flexion
L2, L3, L4 Thigh adduction
L4, L5, S1 Thigh abduction
L5, S1, S2 Extension of leg at the hip (gluteus maximus)
L2, L3, L4 Extension of leg at the knee (quadriceps femoris)
L4, L5, S1, S2 Flexion of leg at the knee (hamstrings)
L4, L5, S1 Dorsiflexion of foot (tibialis anterior)
L4, L5, S1 Extension of toes
L5, S1, S2 Plantar flexion of foot
L5, S1, S2 Flexion of toes

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