Multiple options, including: attend medical school; become employed by an anatomy farm.
As for "chance of being hacked apart," anybody can donate their cadaver to science — most facilities require prior enrollment and will recover the corpse, nationwide.
You might end up sold into scientific experimentation... if you're morbidly obese (e.g.) you won't be used for student anatomy (if you care).
And one example of scientific experiment is being left out on an open field to study how cadavers decompose when exposed to “the elements” wind/rain/sun/bugs/birds/wolves etc to help solve crime scenes. You can look up forensic anthropologists and body farms for more info.
Not my cup of tea, personally, but my ultimate point is you might get used in something you disagree with. Look into the history of cell lines used in medicine for some of the controversy and perpetual pain for surviving family members, as an example.
As for "chance of being hacked apart," anybody can donate their cadaver to science — most facilities require prior enrollment and will recover the corpse, nationwide.
You might end up sold into scientific experimentation... if you're morbidly obese (e.g.) you won't be used for student anatomy (if you care).