Resident Evil 7 Biohazard Get Dissection Room Key. The dissection room key is in the incineration room, in the chamber that is locked. To unlock the chamber, solve the puzzle, close the other chambers that do not have the handprint or the Tamara name. Ethan needs the dissection room key to get to the dissection chamber to get the wolf head. There are 3 wolf head. If one follows the gameplay of resident evil 7 biohazard, this is most likely the third wolf head.