Be careful!

This App is awesome. But the description on the $2.99 one doesnt mention that it is only of he anterior and posterior shoulder. The full App is $23.99 and while it really is amazing, it is misleading that it doesnt state that very clearly in the description.
Studying the muscles is not easy and this App really does help with flashcards that have interactive pictures that allow you to see the muscle in relation to its muscle group as well as by itself. The flash cards even have pictures that illustrate what the muscle is used for and the definitions have insertion, origin, and joints if they apply. There are also quizzes. I recommend it but dont appreciate being roped into something that ended up costing me more $$$ than I wouldve spent with more explanation.

SamJonTerrio about Anatomy In Motion - Complete - Muscle System Flashcards for iPhone and iPad, v2.3