In the back position, the outer ridge is above the back and runs through the whole back, so it is also called the general ridge.
Pole meat,
Hard ridge is tender and lean meat (the butcher shop calls it 3# meat, and some people call it tenderloin); The tenderloin is located on the lower side of the outer ridge, which is a piece of meat between the kidney and the water-dividing bone. The end is slightly thinner and it is the most tender meat (also called tenderloin).