[CRConrad]

> Just so you know, I'm fine with calling "arm" what is between shoulder and wrist.

Great. Since that's actually what it means, in ordinary English. What you call "actually correct" "in anatomy" is professional sub-language and has no bearing on this forum. (Or any other, besides fora for professional anatomists.)

Edit: Sorry, replied to your first paragraph before even reading the rest and noticing that you actually agree... I was already slightly annoyed by your previous post, so wrote hastily. I apologize.