medicalthe grey-brown substance in your brain and spinal cord that consists mainly of the bodies of neurons (=cells that carry messages to and from your brain)
[C]one of the groups of fibres in your body that carry messages between your brain and the rest of your body, communicating pain, pressure, feelings of heat and cold etc 神经
A pinched nerve is causing her a lot of pain. 一根受压迫的神经让她疼得要命。