<prompt> Person wakes up with pain, paresthesia, tingling of the arms. He had slept with arm below the head. Which fibres are involved?Type A fibresType BType C painType C postganglionic  <response>: Pressure on a nerve cause loss of conduction in large diameter motor, touch and pressure ie type A fibre while pain fibre c remains intact. Ref: Ganong;s review of medical physiology; 23rd edition; pg:89. 