Pork tenderloin
Encyclopedia
The pork tenderloin is a cut of pork. It is often sold as prepackaged products by large grocery stores. They are available plain (not seasoned) and flavored with a marinade.

As with all quadruped
Quadruped
Quadrupedalism is a form of land animal locomotion using four limbs or legs. An animal or machine that usually moves in a quadrupedal manner is known as a quadruped, meaning "four feet"...

s, the tenderloin refers to the psoas major muscle along the central spine portion, ventral to the lumbar vertebrae. This is the most tender part of the animal, because these muscles are used for posture, rather than locomotion.

A pork tenderloin sandwich
Pork tenderloin sandwich
The Pork Tenderloin Sandwich contains a breaded and fried cutlet similar to the Wiener Schnitzel and is popular in the Midwest region of the United States.The Pork Tenderloin Sandwich was the subject of a 1998 documentary film,...

(also called simply a "tenderloin") is a very thinly sliced piece of pork, usually the larger, tougher loineye (longissimus) muscle, uniquely battered and breaded, which is deep fried and served on a hamburger bun. This is usually served with mustard, ketchup, pickle and onions. This sandwich is generally only sold in the US Midwest.
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