The Musculus sartorius (lat. für „Tailor muscle“) is one of the skeletal muscles of the thigh. This thin muscle draws from the Spina iliaca anterior superior of the illium of the pelvis over the front- and inside of the thigh til the inside of the shin bone, more precise to the Pes anserinus superficialis. It is the longest muscle of the human body. It is a one headed mandrel shaped muscle (Musculus fusiformis).