Semitendinosus - Anatomy

Origin	From common tendon with long head of biceps femoris from superior medial quadrant of the posterior portion of the ischial tuberosity
Insertion	Superior aspect of medial portion of tibial shaft
Action	Extends the thigh and 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