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Sartorius muscle. The sartorius muscle (/sÉËrËtÉÉri.És/) is the longest muscle in the human body. It is a long, thin, superficial muscle that runs down the length of the thigh in the anterior compartment. 1 Structure 1.1 Nerve supply. 1.2 Variation.
The sartorius muscle in the longest muscle in the body. It is long and thin, running across the thigh in a inferomedial direction. It is found more superficially to the other muscles in the leg. 1  Attachments: Originates from the anterior superior iliac spine, and attaches to the superior, medial surface of the tibia.2  Actions: At the hip joint, it is a flexor, abductor and lateral rotator. 3  At the knee joint, it is also a flexor.he quadriceps femoris is the main extensor of the knee. Vastus Muscles. There are three vastus muscles â vastus medialis, vastus intermedius and vastus lateralis. They are located exactly where their names suggest; the medialis lies on the medial side of the anterior thigh, and the lateralis lies on the lateral side.