I think the difference between tenderloin and external tenderloin is as follows: in position, the tenderloin is the meat in the bone of the back, which is strip-shaped, and the external ridge runs through the whole back; In terms of appearance and texture, tenderloin is long and round, fresh and tender, reddish in color, thicker outside ridge, bigger bones and slightly worse meat quality; In terms of cooking methods, tenderloin is suitable for stir-frying and frying steak, and the outer loin is suitable for stir-frying.