The Sartorius muscle is a long, thin muscle that runs down the front of the thigh. This muscle is also known as the tailor's muscle, due to its use in cross-legged sitting - a position traditionally used by tailors. There are a few synonyms that may be used to refer to the sartorius muscle. One is the longest muscle in the human body, as it spans from the hip bone down to the tibia. Additionally, the sartorius muscle is sometimes referred to as the running muscle, as it is necessary for movement during running. Finally, it could also be called the oblique cord muscle due to its shape and position in the body.