Each concept here is mapped to its prerequisites — the ideas you'd need first to understand it — all the way down to four foundations: Space, Time, Energy, Pattern. Click any prerequisite to drill down, or scroll for the chain graph.
A pattern of muscle contractions in the abdominal region emerges from the understanding of space as a three-dimensional expanse, where a specific arrangement of muscle contractions can be detected and interpreted by an organism.
External reference — all senses of the word “group abs” on Wiktionary. This atlas concept maps to only the slice of meaning relevant to the prerequisite graph.