>>1013219
It's not quite a grid. Pic related is the simplified concept.

Never make me look up posterial cleft again. I'm not sure if you're using the right terms. Since google doesn't know what you're referring to. It pulled up a bunch of cleft palate pictures. Which is just disturbing to look at. Even after putting your terms into quotes, and going around the "did you mean?" option, google still can't identify what those terms mean. So uhh, I'm not entirely sure what you mean either.