semitendinosus muscle
Muscles of
the gluteal and posterior femoral regions with current muscle highlighted
The semitendinosus is a fusiform muscle in the posterior compartment of the thigh and hamstrings muscles. It accompanies the semimembranosus muscle in the medial aspect of the posterior thigh. It is named for its cord-like tendon which forms half way down the thigh.
Summary
- 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)
- extends hip joint (less than biceps femoris)
- arterial supply
- inferior gluteal artery
- perforating arteries
- popliteal artery
- innervation: tibial nerve
- antagonist: quadriceps
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