The Fight in the Fixer - S11-E15
Continuity mistake: When Bones is discussing Angela's cut off point for reconstructions, her hand goes from open and facing to the floor to pointing with one finger at the screen.
The Fight in the Fixer - S11-E15
Revealing mistake: Hodgins turns the furnace off at the start. However the yellow light from the flames in the tunnels disappears before he turns the furnace off.
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.