Long and thin, the Sartorius muscle stretches the distance of the thigh. It originates at anterior superior iliac spine and travels up to the upper tibia's anteromedial surface. As such, the Sartorius is the longest muscle in the human body. The muscle helps flex, adduct, and rotate the hip. In addition, it helps with the knee's flexion. The muscle derives oxygenated blood from the femoral artery. Also, the femoral nerve provides most of the muscle's innervations, but that is also supplemented by the intermediate cutaneous nerve of the thigh. The Sartorius muscle may be susceptible to pes anserine bursitis, which also involves inflammation within the knee's medial portion. Typically, this condition results from overworking the muscle, and it is an occupational hazard for most athletes. Symptoms often include swelling, tender feelings, and pain. Since the muscle covers a range of motion, severe injury such as a tear or rupture will debilitate a person. As a result, the affected person will not be able to walk or adequately move the hips.
Written and medically reviewed by the Healthline Editorial Team
In Depth: Sartorius