When you locate the top (highest resolution, fully bookmarked) version of this PDF, you should expect three distinct sections. Each section is designed to solve a specific artistic problem.
The PDF includes a "hand planes" section. Block out the hand as a mitten for the palm, then five sausages for the fingers. Then, reference the "finger motion" chart to angle the interphalangeal joints. Most beginners over-curve the proximal interphalangeal (PIP) joint and under-curve the distal interphalangeal (DIP). The PDF corrects this with angle diagrams. arm and hand in motion by anatomy for sculptors pdf top
The "Arm and Hand in Motion" PDF breaks down muscle groups not by origin/insertion, but by visual function. When you locate the top (highest resolution, fully