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- Anatomy:
    - origin: upper and lower aspect of ischial tuberosity:
    - insertion: posterior surface of medial condyle of the tibia;
    - action: flexes and medially rotates the calf at the knee. extends, adducts and medially rotates the thigh at the hip;
           - semimembranous is especially important as stabilizing structure around the posterior and posteromedial aspects of the knee;
    - reversed origin-insertion action: when the leg is fixed, gives posterior stability to the pelvis and extends the pelvis on the hip;
    - nerve supply: sciatic (tibial branch), L4, L5, S1, S2: (see innervation);
    - synergists: semitendinosus, biceps, gastrocnemius, gracilis, sartorius;

- 5 distal expansions;
      - oblique popliteal ligament :
      - tendinous attachment is to post capsule & post horn of medial meniscus;
      - anterior portion passing beneath the MCL to insert on tibia;
      - insertion to posterior oblique ligament;
      - expansion to aponeurosis of popliteus muscle;

- Semimembranous Tendinitis:
      - is predominant in males;
      - average age of onset is 32 years;
      - inflammation at the insertion site of direct head of semimembranous tendon into the area of the posterior tubercle of the tibia can be detected by
            increased activity on a bone scan in that region

Semimembranous tendinitis: An overlooked cause of medial knee pain

The semimembranosus-tibial collateral ligament bursa. Anatomical study and magnetic resonance imaging.

Surgical Repair of Complete Proximal Hamstring Tendon Rupture.

The Anatomy of the Posterior Aspect of the Knee An Anatomic Study.