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In this illustration, I am showing the three major muscular forms of the pectoralis along with, for example, the position of its insertion: the upper 2/5ths of the humerus. Understanding these types of proportions are important for my students in the Écorché class because they have to sculpt these complicated muscular shapes and must know their actual placement. I give these handouts to my students with the intention of making this information more accessible visually and introducing them to a solid system of study.