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The Semimembranosus is a member of the Hamstring Group, which is composed of the:
- Biceps femoris
- The semimembranosus attaches from the ischial tuberosity to the posterior surface of the medial condyle of the tibia.
- Flexes the leg at the knee joint.
- Extends the thigh at the hip joint.
- Posteriorly tilts the pelvis at the hip joint.
- Medially rotates the leg at the knee joint.
NOTE: The semimembranosus is named for its long flat (membrane-like) proximal tendon.