The semimembranosus muscle is one of the three muscles that make up the hamstring. It is found on the back of the thigh and runs from the base of the pelvis (specifically the tuberosity of the ischium) to the back of the tibia, one of the bones that make up the lower leg. The semimembranosus muscle is attached to the pelvis and tibia with tendons. The semimembranosus muscle has several functions, including enabling the leg to flex and rotate and serving as a thigh extensor. The other two muscles that make up the hamstring are the semitendinosus and biceps femorus muscles. An injury to the semimembranosus muscle is considered a hamstring injury. Treatment for hamstring injuries includes cold being applied to the affected area, stretching, massaging, and -- though it may seem paradoxical -- using the injured muscle as soon as possible after the injury. This helps promote the growth of new muscle fibers to replace those damaged by injury. Properly warming up and stretching before exercise will help prevent injury to the semimembranosus muscle.
Written and medically reviewed by the Healthline Editorial Team
In Depth: Semimembranosus