SEMIMEMBRANOSUS
| ORIGIN Upper outer quadrant of posterior surface of ischial tuberosity |
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| INSERTION Medial condyle of tibia below articular margin, fascia over popliteus and oblique popliteal ligament |
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| ACTION Flexes and medially rotates knee. Extends hip |
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| NERVE Tibial portion of sciatic nerve (L5, S1) |