The Plain in the Prodigy - S5-E3
Audio problem: We see Angela swipe her card and walk up onto the platform to get the skull at the start. When she walks up you can hear the beeps from her swiping her card. After she walks up, an extra swipes his card to walk up but no beep is heard. (00:04:10)
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.