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Motor Localisation: Myotomes & Peripheral Nerves – Evidence Reviewed

Motor Localisation: Myotomes & Peripheral Nerves

///Motor Localisation: Myotomes & Peripheral Nerves
Motor Localisation: Myotomes & Peripheral Nerves 2018-01-30T16:37:22+08:00
  • UMN: spasticity, hyperreflexia, clonus, positive Babinski. No fasciculations, mild wasting
  • LMN: flaccid, hyporeflexic / arreflexic, absent Babinski. Severe wasting with fasciculations

 

Upper limb motor innervation:

Action Muscle Nerve Root
Shoulder abduction Deltoid Axillary C5
Elbow flexion Biceps Musculocutaneous C5,6
Elbow extension Triceps Radial C7,8
Wrist flexion Flexor carpii Median & ulnar C6,7
Wrist extension Extensor carpii Radial C7,8
Finger flexors FDP, FDS Median & ulnar C8,T1
Finger extensors Extensor digitorum Posterior interosseous C7,8
Finger abduction Dorsal interossei Ulnar T1
Finger adduction Palmar interossei Ulnar T1
Thumb abduction Abductor pollicis brevis Median T1
Thumb adduction Adductor pollicis Ulnar T1

 

Lower limb motor innervation:

Action Muscle Nerve Root
Hip flexion Iliopsoas Femoral L1,2
Hip adduction Hip adductors Obturator L2,3
Hip abduction Gluteus minimus, medius Superior gluteal L4,5
Hip extension Hip extensors Inferior gluteal L5,S1
Knee extension Quadriceps Femoral L3,4
Knee flexion Hamstrings Sciatic L5,S1
Ankle dorsiflexion Tibialis anterior Deep peroneal L5,S1
Ankle plantarflexion Gastrocnemius Tibial S1,2
Foot inversion Tibialis posterior Tibial L4,5
Foot eversion Peroneus longus Superficial peroneal L5,S1
Toe extension EHL Deep peroneal L5,S1

 

Reflexes:

  • Biceps: C5,6
  • Supinator: C6,7
  • Triceps: C7,8
  • Knee: L3,4
  • Ankle: S1,2
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