The Monster in the Closet - S11-E13
Camille: Eh, sorry to interrupt, but I believe you are standing in my favorite hiding spot.
Angela: I'm not hiding. Just needed a quiet spot, so I could plot how to kill my jerk of a husband.
Camille: If anyone could get away with it...
Angela: Yeah, I totally could.
Answer: Since the palatine bone is a bone that helps form the mouth it has a lot to do with speaking. The shape of it differs a lot depending on your ethnic background. I would guess that they, in the show, meant that the person's bone tells that they were Japanese and that it was "made for the purpose of speaking Japanese." That's what I'd assume anyway. I've studied molecular biology though, so I'm not an expert on bones.