They just showed it, and danced with you and let you feel it, and watched and felt what you were doing and told you if you were doing what they meant. So no, they didn't go into anatomical detail.
So.. basically like most aikido classes around the world (including the OP's).
I think we need more people like the OP to say, "thanks, but that really isn't helping me do it or understand." I should have been more vocal especially when someone once said at a dojo I visited, "you'll just get it someday."