The origin of the Sartorius muscle is from the
the longest muscle in the body, extending from the pelvis to the calf of the leg. It is a narrow ribbon-shaped muscle that arises from the anterior superior iliac spine, passes obliquely across the proximal anterior part of the thigh from the lateral to the medial side, and inserts into the tibia.he longest muscle in the body, extending from the pelvis to the calf of the leg. It is a narrow ribbon-shaped muscle that arises from the anterior superior iliac spine, passes obliquely across the proximal anterior part of the thigh from the lateral to the medial side, and inserts into the tibia.