ABSTRACT The axial complex is a specific concept in the Rolfing® Structural Integration paradigm. In this article, Jan H. Sultan presents how Rolfers draw from embryology to conceptualize what anatomy and physiology are represented by the axial complex: the neurocranium, the spine, the sacrum, and their associated soft tissues. Fryette’s laws are a useful base when working with axial tissue, as well as Jean-Pierre Barral’s, DO, motility concept and John Upledger’s, DO, third rhythm. Sultan describes how he synthesizes information to execute the specific technology of Rolfing SI.