From WikiMSK

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Semitendinosus Gray.png
Muscle Type
Origin Ischial tuberosity
Insertion As part of the pes anserine tendon, onto the medial superior tibia
Action flexes knee joint, medially rotates knee joint (when the knee is flexed beyond 90 degrees), extends hip joint (less than biceps femoris)
Antagonists Quadriceps Femoris
Spinal innervation L5, S1, S2
Peripheral Innervation Tibial Nerve
Vasculature Inferior gluteal artery, perforating arteries, popliteal artery