RE: tenderloin vs backstrap
if you think of it as beef ; the T-bone steak is the one with the little real tender part and the bigger part that is also tender but not quite as much as the littler one.the little part is the tenderloin ; the bigger part is the back strap.
after you leave that small section of the back,there are no small sections wiith the steak,getting into the porterhouse.
the back strap runs from the middle of the front shoulder to the ham joint.the tender loin is inside the body cavity about 12" long.
thats the way I look at it.[:-]