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