Quite good
This app is light years ahead of the old 2 dimensional versions I had when I studied to become a physical therapist 20 years ago. Vital missing link is the missing landmarks on bones (tubercles etc) which one needs to insert in order to know the precise origins & insertions of muscles. Totally worth the cost. Using the muscles 2 app in conjunction with this app allows one to really get a picture of how the various muscles function.
What2ReafNext about
Essential Anatomy 5