Semimembranosus - Anatomy

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 (L5, S1, S2)
Arterial Supply	Perforating branches of profunda femoris artery, inferior gluteal artery, and the superior muscular branches of popliteal artery