3 - D Brain is available on line for PCs or as an i-app or android app.
The Biology Department at Lone Star College provides many links explaining physiology that will help you.
This MOOC (Massively open online course) from Harvard introduces you to five common musculoskeletal injuries through the initial examination, diagnosis and surgery. Information is available in short videos and embedded quizzes. You will need to register with EdX and enroll with the class to view the archived materials -- all at absolutely no cost.