Physiology Person wakes up with pain, paresthesia, tingling of the arms. He had slept with arm below the head. Which fibres are involved? A Type A fibres B Type B C Type C (pain) D Type C (postganglionic) 💡 Explanation Person wakes up with pain, paresthesia, tingling of the arms. He had slept with arm below the head. Which fibres are involved? ✓ Correct Answer: A. Type A fibres