What are satorius?

The sartorius is a long, thin muscle located in the thigh. It runs from the hip to the knee, crossing over the front of the thigh, and is involved in actions like flexing, abducting, and laterally rotating the hip, as well as flexing the knee. It is often referred to as the "tailor's muscle" because its actions are similar to the position a tailor assumes while sitting cross-legged. This muscle is the longest in the human body.