Parts is parts!
Much of the supermarket and fast food meat we eat today is mechanically separated meat (MSM), mechanically recovered/reclaimed meat (MRM), or mechanically deboned meat (MDM a paste-like meat product produced by forcing pureed or ground meat under pressure through a sieve or similar device to separate the bone from the edible meat tissue. It is sometimes called white slime or pink slime. The process entails pureeing or grinding the carcass left after the manual removal of meat from the bones and then forcing the slurry through a sieve under pressure. This puree includes bone, bone marrow, skin, nerves, blood vessels, and the scraps of meat remaining on the bones.
Yum!