When you are presented with a CNS case, a quick look at the movements of the patient can guide you to the site of lesion.

Look below for the nerve supply for different areas of the body

Upper body

  • C1 to C6- Neck flexion
  • C1 to T1- Neck extension
  • C3 to C5- Supply to diaphragm
  • C5 to C6- Raising arm and elbow flexion
  • C6- Externally rotate arm
  • C6 to C7- extension of elbow and wrist/ Pronate arm
  • C7 to T1- Flexion of wrist
  • C7 to T1- supplies small muscles of hand

Lower body

  • T1 to T6- Intercostal muscles of chest
  • T7 to L1- Abdominal muscles
  • L1 to L4 thigh flexion
  • L2 to L4- Thigh adduction
  • L4 to S1- Thigh abduction
  • L5 to S2- Extension at hip joint
  • L2 to L4- Extension at knee
  • L4 to S2- Flexion of knee
  • L4 to S1- Dorsiflexion of foot and extension of toes
  • L5 to S2- Plantar flexion of foot and flexion of toes

Reflexes and nerve connection

  1. Biceps reflex- C5
  2. Supinator reflex- C5
  3. Triceps reflex- C7
  4. Knee reflex- L2 and L3
  5. Ankle reflex- L5 and S1

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