Joe Muscolino

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The semimembranosus of the hamstring group.

The Semimembranosus is a member of the Hamstring Group, which is composed of the:

  • Semitendinosus
  • Semimembranosus
  • 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.