Old anatomy study drawings

Here are some of my anatomy study drawings I had done few months back. I forgot the name of the book (from library) I used for reference. It was something like Anatomy for figure drawing. I made these drawing to study general muscles and bones in male torso (hand and chest). I am planning to do similar drawings with more details of muscles some day soon. I did shading in these images to see in more details how shapes or volumes are formed.