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Semitendinosus muscle
Last reviewed: 07.07.2025
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The semitendinosus muscle (m.semitendinosus) begins together with the long head of the biceps femoris on the ischial tuberosity. At the level of the middle third of the thigh, it passes into a long tendon, which runs down on the posteromedial side of the knee joint and is attached to the medial surface of the upper part of the tibia (participates in the formation of the superficial pes anserinus).
Function of the semitendinosus muscle: extends the thigh, flexes the leg; when the leg is bent at the knee joint, it rotates it inward.
Innervation of the semitendinosus muscle: tibial nerve (LIV-SI).
Blood supply of the semitendinosus muscle: perforating arteries.
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