The answer is a hope this helps
Well, just the fact that the characters are all dressed up for a masquerade party, already adds to the eerie mood. But what really seals the coffin is when Montressor lures Fortunato into the catacombs, and then ties him up. You really get the whole creepo-vibe, when Montressor starts to seal up the "tomb". Hope this helps you a lot.
The study of the structure of a human or an animal body.