I know........and every muscle is attaches at an origin and a insertion point into bone. Some become a tendon before insertion but they all are attached to bone. Muscles primary function is motion. If they weren't attached to a bone they would not be of much use.

The tenderloins are not used because deer walk on all fours. They still get used.......just very little which is why they are so tender.

I will check along the spine inside the ribcage of the next deer I butcher and see what you are talking about.