The 7-minute rotator cuff solution by health for life is an excellent book for explaining the anatomy and biomechanics of the shoulder. That book is over 200 pages and is two parts one for laymen and a second much more detailed part for health care professionals. One of my Karate teachers is a chiropractor, after I told him some of what I had learned from that book he said my knowledge of the anatomy of the shoulder was better than his. If that gives you any idea of the detail the book goes into.