Musculus semimembranosus

The semimembranosus (/ˌsɛmiˌmɛmbrəˈnoʊsəs/) is the most medial of the three hamstring muscles. It is so named because it has a flat tendon of origin. It lies posteromedially in the thigh, deep to the semitendinosus.Right hip bone. External surface.Bones of the right leg. Posterior surface.The popliteal, posterior tibial, and peroneal arteries.Back of left lower extremity.Semimembranosus muscleSemimembranosus muscleMuscles of thigh. Lateral view.Muscles of thigh. Cross section.Muscles of thigh. Anterior views. The semimembranosus (/ˌsɛmiˌmɛmbrəˈnoʊsəs/) is the most medial of the three hamstring muscles. It is so named because it has a flat tendon of origin. It lies posteromedially in the thigh, deep to the semitendinosus. The semimembranosus, so called from its membranous tendon of origin, is situated at the back and medial side of the thigh. Its origin is the superolateral aspect of the ischial tuberosity and it inserts on the medial condyle and nearby margin of tibia; intercondylar fossa of femur and medial condyle of femur; and the ligament of the popliteal region (at the back of the knee). It arises by a thick tendon from the upper and outer impression on the ischial tuberosity, above and medial to the biceps femoris and semitendinosus. The tendon of origin expands into an aponeurosis, which covers the upper part of the anterior surface of the muscle; from this aponeurosis, muscular fibers arise, and converge to another aponeurosis which covers the lower part of the posterior surface of the muscle and contracts into the tendon of insertion.