I copied some poses from a book on anatomy for the drawing exercise -skeletal study. You can see that my understanding of the skeleton isn't great. It was only when I got to the back of the book, after I'd finished the drawings, that I discovered a section that detailed the anatomy in skeleton and muscular form. I photographed the images and I'm posting them here for future reference, and as a backup.

 

 

Images sourced from 'Anatomy lessons from the great masters' by Robert Beverly Hale and Terence Coyle, 1977, Watson-Guptill publications, N.Y.