Anonymous asked: In response to the previous answer, I would like to clarify that I wasn't thinking of cuts of meat, but rather things such as whole hogs that have been properly refrigerated and preserved. This is why I was specific about the butcher shop and not any other meat distributor. To me, refrigerated flesh makes as much scientific sense as a formaldehyde preserved brain stored at room temperature.
Hm. I thought you meant butchered meat only because save for the rare pig’s head, preserving whole animals skin and all doesn’t seem to be a thing butcher shops do. I had watched an episode of dirty jobs as reference, and the butcher shop he worked with would remove the organs, skin and decapitate the animal, and hang up the carcass in a refrigerator. But you are correct that many butcher shops from different regions and cultures would possibly keep whole animals preserved save for their guts.
While you have a point about revitalizing dead matter like Vis does with the brain, the brain is an organ in the central nervous system, not a muscle. Dead muscle sets in rigor mortis about 3 - 4 hours after death, and becomes its strongest rigidity at around 12 hours. Following that, it takes about 2 days for the muscle to loosen and become limp.
More specifically, when death occurs, decomposing cells release stored calcium as they decay, which binds to a protein called troponin, temporarily changing its chemical structure. This prompts cellular filaments called myosin to pull on filaments called sarcomeres (which had been ‘blocked off’ by troponin), which contracts the muscle. Normally, the body would then release a chemical to detach the calcium from the troponin, and make the muscle filaments relax. However, as the neurons that do that are dead, they cannot, and the muscle stays stiff. The only way it loosens is when those filaments decay and break off.
So, dead muscle like you would find in a butcher shop, or more relatably, a dead body in a morgue, would be useless to Vis. The cellular structure of the muscle would be completely rotted away.