The |semimembranosus| muscle is one of the hamstring muscles. It flexes the lower leg at the |knee joint| and rotates it in. It consists of a fleshy muscle belly with a ~tendon~ at each end. The |muscle fibers| extend downward from the knee to the middle of the outer ~condyle~ of the |femur| (upper leg bone). The ~tendon~ of the |semimembranosus| muscle, along with the |semitendinosus| and |gracilis|, form the inner hamstring.
