What path does the rear delt move in?

[kotetsu]

I think I have a lot of trouble with my posterior deltoid simply because I don't know, or can't visualize, the direction that it's pulling my arm. Can anyone illustrate the motion? Is there a video or a picture or something I can check out?

[brobdignagian]

look at this weeks fit show with Milos! He explains each part of the delts!

http://www.bodybuilding.com/fun/fitshow.htm