Cartesius (1974)

One scene takes place during a dissection. We see a partially dissected human body on the table (some blood, no nudity). The man performing the dissection also takes the heart from a small animal, and holds it in his hand while speaking with the protagonist.

A village is apparently experiencing a plague. While we do not see the results of said plague, the doctors walk around in black robes and somewhat frightening bird-like masks.