THIS BOOK IS A "MUST HAVE". It is not the only drawing book that you need in your personal library, but it is one of the most essential.
The book includes about seventy well-drawn male and female nude drawings, grouped by type of pose (standing, crouching, twisting, etc.). Each of the seventy poses is drawn three times --
(1) as an annotated finished drawing,
(2) as an annotated (identically sized) skeleton in the same pose, and
(3) as an annotated (identically sized) muscle diagram in the same pose.
The anatomy is at a level of detail designed for the figure-drawing artist, not for the medical illustrator. As such, only those muscles and bones that are significant to a particular pose are labeled, and are described with simplified nomenclature.
I remember complaining to my instructor that I could discern the rib cage in our male model, but not in this rounded-back posed female model. This book is the ideal reference for seeing the support infrastructure in such situations.
Although there are many approaches to figure drawing, understanding the effects that underlying anatomical infrastructure have on surface anatomy is essential to realistic drawing. In addition to this book, you should also have other books in your figure drawing library, that cover croquis, circles & guidelines, tonal masses, planes, gestures, cylinders, lighting, proportions, contours, and other techniques. But Joseph Sheppard's "Drawing the Living Figure" will be your primary anatomical reference.