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