If it's anatomy you need, go to the library and check out a copy of
Gray's Anatomy.\
Honestly, though, I'd suggest thinking twice about making a medical game unless you know what you're doing. I mean, not every game can be "Caduceus"/ "Trauma Center," and it would be embarrassing to have your game nitpicked over. Definitely do some research.
If you still want to have a "Medical' game but aren't; certain you can get the science right you might consider a fantasy or pseudoscientific route, such as having the doctor using- magic or weird tech, which doesn't necessarily have to know where things are- or use acupuncture meridians, which "Connect to" areas of the body but don't necessarily lie on them.