I strained a muscle in my back at work yesterday and when talking to the nurse on the phone who recorded my injury report for the company, I was asked if the pain was in my upper or lower back. I told him it was directly in between, in the middle of my back. He told me "That's not the way the muscles in your back work. It has to be either upper or lower back. So which is it?" Obviously we have muscles in the middle of our back too, so did he give me incorrect information or is it somehow really not possible to strain a mid-back muscle?