The Murder in the Middle East - S10-E19
Continuity mistake: In all shots of Cam talking on her phone to Arastoo after the first, what's on the bottom of the phone is different to the first. Later, when she has the phone is on the table, what was on the bottom in the later shots is at the top of the phone, suggesting at some point she started talking on it upside down. (00:02:53 - 00:04:05)
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.