This is the lateral hamstring muscle. Its long head originates from the ischial tuberosity, merging with the sacrotuberous ligament fibers. Therefore, tension in the hamstring pulls directly on the STL, which pulls on the sacrum.
Why "Andersson"? The name carries connotations of mid-century modern pragmatism. Where German engineering often over-engineers with brute force, and American engineering historically favored replaceable abundance, the Swedish approach—exemplified by figures like Gunnar Andersson (a noted automotive engineer) or the legacy of industrial designers at Saab—focuses on lagom : just the right amount. andersson link
The by Andersen Furniture is a modular, high-end furniture system designed for flexibility. A "complete piece" or modular setup typically includes: This is the lateral hamstring muscle
To understand the Link, you must understand the "myofascial sling" it creates. Why "Andersson"
He argued against pure reductionism—the idea that you can understand a complex system just by looking at its smallest parts.