Pork tenderloin, also called pork fillet,[1]pork steak[2] or Gentleman's Cut, is a long, thin cut of pork.
As with all (mammalian) quadrupeds, the tenderloin refers to the psoas major muscle[3] along the central spine portion, ventral to the lumbar vertebrae, the most tender part of the animal, because those muscles are used for posture rather than locomotion.
^Campbell, G.; Ekman, M. (1992). Classic Irish Recipes. William G. Lockwood and Yvonne R. Lockwood Collection of National, Ethnic and Regional Foodways. Sterling Pub. p. 38. ISBN978-0-8069-8444-5. Retrieved June 20, 2022.