Outer (in terms of blocking) is "soto"; Inner is "uchi", "naka" or other.
You can see how this can be challenging: Koi no shippo uchi, uchi uchi! "Carp tail strike, inner strike"! (Actually, there are other ways to express this -- I'm being a wise guy.)
You have hit on a simple but interesting difference in doing Uechi ryu "in English" and doing the same "in Japanese". In English, we are doing fishtail "blocks". In Japanese, we are doing fishtail "STRIKES"!
How does this change your thinking?! How does it change the movement? The application?
There are other exmples, but this is a good beginning!
Gary J. Khoury http://www.uechi-ryu.com/khoury