Nerve Anatomy

Question 1

How would a median nerve supply?

Answer 1

• Upper arm
• Distal forearm
• Motor supply to the hand excluding intrinsic muscles
• Sensory: Thumb and lateral 2.5 fingers

Question 2

How would a median nerve injury present?

Answer 2

Wrist:
Carpal tunnel syndrome
- Paralysis/wasting of the thenar muscles
- Sensory loss to palmar aspect of lateral fingers

Elbow
- Weak wrist flexion
- Ulnar deviation of wrist
- Unable to pronate forearm

Question 3

How would an ulnar nerve supply?

Answer 3

Motor: intrinsic hand muscles
- Sensory: Medial 1.5 fingers

Question 4

How does ulnar nerve damage present?

Answer 4

• Claw hand
• Wasting/paralysis of the intrinsic hand muscles
• Wasting/paralysis of the hypothenar muscles
• Sensory loss to the medial 1 1/2 fingers

Question 5

How would radial nerve supply?

Answer 5

Motor: Triceps, forearm muscles
Sensory: Small area at proximal phalanges on the dorsal aspect of the hands

Question 6

How would radial nerve damage present?

Answer 6

Shoulder: impaired shoulder abduction
Triceps: Loss of elbow extension
Forearm: Weakening of supination and elbow flexion
- Wrist drop