Back issues Limb or Torso?

Having scoured the disability handbook link and the a-z of medical conditions I still cant find an answer to this.For purposes related to my appeal of WRAG ESA i am trying to find out exactly where I scored points. I have a good idea as I have a long standing disability with my knees and this affects my back too. I have a lesser issue with my right hand which may have scored me points on manual dexterity descriptor. I wonder if any members know whether the back is classed as an upper or lower limb in the medical terminology? Or would it be merely referred to as the torso?
i ask as the ESA 85a is predictably vague and says onkly that I have disability due to uper and lower limb muscoskeletal problems.For example the neck seems to be classed asant.ic a limb ( upper obviously)..I know it sounds an odd question but it would shed some light and could prove signif

I asked for that Gordon even used the template from here but recieved only the ESA85a and (some) of the medical evidence I sent them. A letter explaining my disabilities and how they affect me seems to have not been forwarded to the DM from Atos There was no request to my GP for info from what I was told by phone and as I say I havent been forwarded any scoresheet.You are saying the back would be upper body as opposed to upper limbs?

Actually Gordon, when I called and stated that I didnt think everything I requested was sent to me in the post I was told " that was all they could find"

sorry Gordon I dont think my last reply went through properly. By score sheet I assume you mean details of which descriptors you scored points on and how many? Are the DWP duty bound to divulge this if requested?