fundamentals of anatomy and physiology, Cadaver Course -- One of the best ways to learn is to get both hands dirty! I went to this specific class and it was AMAZING! We are so used to considering these tissues as individual, as they appear in books, but are all intertwined together! It had been eye opening to see the materials of the rhomboid fan in to the fibers of the Serratus! This looked like one muscle! This can be a link to the RTS web site. They have a cadaver class throughout Pittsburgh and in Connecticut.
In case you are in another part of the world, you need to be able to find a cadaver category at any university with associated courses. The cool point about the RTS anatomy aesthetic is you can get continuing education credit, and it is a requirement for your own personal Resistance Training Specialist certification. However don't let it stop you or even in CT or Pittsburgh, find a class and get the hands dirty!