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The semimembranosus muscle is the deepest and inner most of the hamstring muscles, found on the inner (medial) side of the back of the thigh. It runs almost directly below one of the other hamstring muscles, semitendinosus.
In the lower part of the thigh, semitendinosus and semimembranosus together form the upper medial boundary of the popliteal fossa. It's primary action is knee flexion,knee internal rotation and hip extension . It also plays a main role providing knee stability.
2 Αυγ 2023 · Semimembranosus is a hamstring muscle that acts on the hip and knee joints. Learn more about its anatomy and functions at Kenhub!
The semimembranosus muscle (/ ˌsɛmiˌmɛmbrəˈnoʊsəs /) is the most medial of the three hamstring muscles in the thigh. It is so named because it has a flat tendon of origin. It lies posteromedially in the thigh, deep to the semitendinosus muscle. It extends the hip joint and flexes the knee joint.
The most important function of the semimembranosus muscle is flexion and internal rotation of the knee joint. It also stabilizes the pelvis and causes extension of the hip joint. There is a U-shaped bursa that surrounds the distal SM tendon, separating the distal aspects of the tendon from the medial tibial plateau, MCL, and semitendinosus.
2 Ιαν 2022 · Summary. Semimembranosus. Origin. Superior lateral quadrant of the ischial tuberosity. Insertion. Posterior surface of the medial tibial condyle. Action. Extends the thigh, flexes the knee, and also rotates the tibia medially, especially when the knee is flexed. Innervation.
The semimembranosus muscle acts on both the hip and the knee joint in the same way as the other two muscles of the posterior compartment of the thigh. It's also an antagonist of the quadriceps femoris .
