Originally Posted by Captain Tom Coughlin
Romulan anatomy never made sense to me, if they came from Vulcan then they should be Vulcans but with a different society, not a different race. That's why in the new movie I was glad that they didn't have the ridges, which never made any sense to me.
I'm not sure how closely all the writers thought about those aspects. But yeah, no clue about ridges and what that was about.