Mostly to create gothic Flesh Golems, though some get used to make hotdogs.
For serious though, any bits removed from a human get destroyed as toxic, medical waste. Literally thrown into a giant incinerator and burned to dust. This is why no one is ever allowed to take ZYX home in a jar anymore. It’s all tightly regulated now.
EDIT – I stand corrected, depending on where you are (In the US at least) you may be able to get your bits returned to you if you ask. Some states have laws preventing it though.
Mostly to the hospital’s incinerator/crematorium for disposal. But some people might be able to [take them home](https://www.pbs.org/newshour/science/took-amputated-leg-home-can) or arrange for them to be buried depending on local laws. Here’s a [pamphlet](http://flipbooks.leedsth.nhs.uk/LN004531.pdf) from Leeds hospital explaining the procedure if you choose to have your amputated limb buried and how to arrange that. Apparently they will keep your limb for up to 28 days so you can make the arrangements. How convenient
They go to the pathology department, usually attached to the hospital’s morgue. There they can be analyzed if needed. After that, they may be returned to the patient if requested or may be disposed of as medical waste. Source: my girlfriend at uni worked in the morgue and was the one who would take amputated things from operating rooms to Surgical Pathology.
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