The Finger in the Nest - S4-E4
Visible crew/equipment: After Hodgins examines the victim's car at the FBI, the next scene has Booth's truck driving down a country road, passing the camera in a close-up. As it passes the camera, reflected in the door is the cameraman's torso & arm. (00:14:30)
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.