A-Delta Fast Pain — FRCA Primary MCQ
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Correct answer: D — Sharp well-localised fast pain
A-delta fibres are lightly myelinated (1-5 μm diameter / 5-30 m/s) transmitting sharp well-localised first pain. C fibres are unmyelinated (0.2-1.5 μm / 0.5-2 m/s) transmitting dull diffuse burning second pain.
Reference: Power Kam 2018 Principles of Physiology for the Anaesthetist