Muscle Atlas

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: Tibial nerve
Arterial Supply: Perforating branches of profunda femoris artery, inferior gluteal artery, and the superior muscular branches of popliteal artery


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