"ObliqLiques cause lateral rotation of eyeball":
· Obliques cause lateral, all other rectii are medial rotators of the eyeball.
Action of the obliques is opposite to their names.
Action of the rectii is rightly fitting to their names.
Both superiors cause intorsion and both inferiors cause extorsion.
That's from medicalmnemonics.com, I suggest drawing a picture of how you would test the muscles though, you know the big "H". I draw it with an eyeball an ear and a nose. That way you'll never forget it.
-J